UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
________________________________________________________
FORM 10-Q
________________________________________________________
(Mark One)

ý | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2015.

¨ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to .
Commission File Number 0-20288
________________________________________________________
COLUMBIA BANKING SYSTEM, INC.
(Exact name of issuer as specified in its charter)
________________________________________________________

Washington |  | 91-1422237
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)
1301 A Street Tacoma, Washington |  | 98402-2156
(Address of principal executive offices) |  | (Zip Code)

(253) 305-1900
(Issuer’s telephone number, including area code)
(Former name, former address and former fiscal year, if changed since last report)
________________________________________________________
Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý No ¨
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer |  | ý |  | Accelerated filer |  | ¨
Non-accelerated filer |  | ¨ |  | Smaller reporting company |  | ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No ý
The number of shares of common stock outstanding at April 30, 2015 was 57,692,047.

TABLE OF CONTENTS

|  | Page
| PART I — FINANCIAL INFORMATION |
Item 1. | Financial Statements (unaudited) |
| Consolidated Balance Sheets - March 31, 2015 and December 31, 2014 | 1
| Consolidated Statements of Income - three months ended March 31, 2015 and 2014 | 2
| Consolidated Statements of Comprehensive Income - three months ended March 31, 2015 and 2014 | 3
| Consolidated Statements of Changes in Shareholders’ Equity - three months ended March 31, 2015 and 2014 | 4
| Consolidated Statements of Cash Flows - three months ended March 31, 2015 and 2014 | 5
| Notes to Unaudited Consolidated Financial Statements | 6
Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 35
Item 3. | Quantitative and Qualitative Disclosures about Market Risk | 53
Item 4. | Controls and Procedures | 53
| PART II — OTHER INFORMATION |
Item 1. | Legal Proceedings | 54
Item 1A. | Risk Factors | 54
Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds | 54
Item 3. | Defaults Upon Senior Securities | 54
Item 4. | Mine Safety Disclosures | 54
Item 5. | Other Information | 54
Item 6. | Exhibits | 55
| Signatures | 56

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PART I - FINANCIAL INFORMATION
Item 1. FINANCIAL STATEMENTS
CONSOLIDATED BALANCE SHEETS
Columbia Banking System, Inc.
(Unaudited)

|  |  |  |  | March 31, 2015 |  | December 31, 2014
ASSETS |  | (in thousands)
Cash and due from banks |  | $ | 177,026 |  |  | $ | 171,221 |
Interest-earning deposits with banks |  | 71,575 |  |  | 16,949 |
Total cash and cash equivalents |  | 248,601 |  |  | 188,170 |
Securities available for sale at fair value (amortized cost of $1,981,977 and $2,087,069, respectively) |  | 2,007,159 |  |  | 2,098,257 |
Federal Home Loan Bank stock at cost |  | 33,004 |  |  | 33,365 |
Loans held for sale |  | 3,545 |  |  | 1,116 |
Loans, net of unearned income of ($53,867) and ($59,374), respectively |  | 5,450,895 |  |  | 5,445,378 |
Less: allowance for loan and lease losses |  | 70,234 |  |  | 69,569 |
Loans, net |  | 5,380,661 |  |  | 5,375,809 |
FDIC loss-sharing asset |  | 14,644 |  |  | 15,174 |
Interest receivable |  | 29,088 |  |  | 27,802 |
Premises and equipment, net |  | 172,958 |  |  | 172,090 |
Other real estate owned |  | 23,299 |  |  | 22,190 |
Goodwill |  | 382,537 |  |  | 382,537 |
Other intangible assets, net |  | 28,642 |  |  | 30,459 |
Other assets |  | 228,764 |  |  | 231,877 |
Total assets |  | $ | 8,552,902 |  |  | $ | 8,578,846 |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Deposits: |  |  |  |  |  |  |
Noninterest-bearing |  | $ | 3,260,376 |  |  | $ | 2,651,373 |
Interest-bearing |  | 3,814,589 |  |  | 4,273,349 |
Total deposits |  | 7,074,965 |  |  | 6,924,722 |
Federal Home Loan Bank advances |  | 36,559 |  |  | 216,568 |
Securities sold under agreements to repurchase |  | 96,852 |  |  | 105,080 |
Other borrowings |  | — |  |  | 8,248 |
Other liabilities |  | 100,083 |  |  | 96,053 |
Total liabilities |  | 7,308,459 |  |  | 7,350,671 |
Commitments and contingent liabilities |  |  |  |
Shareholders’ equity: |  |  |  |  |  |  |
| March 31, 2015 |  | December 31, 2014 |  |  |  |
Preferred stock (no par value) | (in thousands) |  |  |  |
Authorized shares | 2,000 |  |  | 2,000 |  |  |  |  |
Issued and outstanding | 9 |  |  | 9 |  |  | 2,217 |  |  | 2,217 |
Common stock (no par value) |  |  |  |  |  |  |
Authorized shares | 63,033 |  |  | 63,033 |  |  |  |  |
Issued and outstanding | 57,699 |  |  | 57,437 |  |  | 986,348 |  |  | 985,839 |
Retained earnings |  | 241,592 |  |  | 234,498 |
Accumulated other comprehensive income |  | 14,286 |  |  | 5,621 |
Total shareholders’ equity |  | 1,244,443 |  |  | 1,228,175 |
Total liabilities and shareholders’ equity |  | $ | 8,552,902 |  |  | $ | 8,578,846 |

See accompanying Notes to unaudited Consolidated Financial Statements.
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CONSOLIDATED STATEMENTS OF INCOME
Columbia Banking System, Inc.
(Unaudited)

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands except per share amounts)
Interest Income |  |  |  |
Loans |  | $ | 70,822 |  |  | $ | 65,541 |
Taxable securities |  | 7,526 |  |  | 6,752 |
Tax-exempt securities |  | 3,042 |  |  | 2,618 |
Deposits in banks |  | 27 |  |  | 14 |
Total interest income |  | 81,417 |  |  | 74,925 |
Interest Expense |  |  |  |
Deposits |  | 748 |  |  | 752 |
Federal Home Loan Bank advances |  | 159 |  |  | 114 |
Other borrowings |  | 146 |  |  | 119 |
Total interest expense |  | 1,053 |  |  | 985 |
Net Interest Income |  | 80,364 |  |  | 73,940 |
Provision for loan and lease losses |  | 1,209 |  |  | 1,922 |
Net interest income after provision for loan and lease losses |  | 79,155 |  |  | 72,018 |
Noninterest Income |  |  |  |
Service charges and other fees |  | 14,869 |  |  | 12,936 |
Merchant services fees |  | 2,040 |  |  | 1,870 |
Investment securities gains, net |  | 721 |  |  | 223 |
Bank owned life insurance |  | 1,078 |  |  | 965 |
Change in FDIC loss-sharing asset |  | 150 |  |  | (4,819 | )
Other |  | 3,909 |  |  | 2,833 |
Total noninterest income |  | 22,767 |  |  | 14,008 |
Noninterest Expense |  |  |  |
Compensation and employee benefits |  | 39,100 |  |  | 31,338 |
Occupancy |  | 7,993 |  |  | 8,244 |
Merchant processing |  | 977 |  |  | 980 |
Advertising and promotion |  | 931 |  |  | 769 |
Data processing and communications |  | 4,984 |  |  | 3,520 |
Legal and professional fees |  | 2,507 |  |  | 2,169 |
Taxes, licenses and fees |  | 1,232 |  |  | 1,180 |
Regulatory premiums |  | 1,221 |  |  | 1,176 |
Net cost (benefit) of operation of other real estate owned |  | (1,246 | ) |  | 146 |
Amortization of intangibles |  | 1,817 |  |  | 1,580 |
Other |  | 7,218 |  |  | 6,284 |
Total noninterest expense |  | 66,734 |  |  | 57,386 |
Income before income taxes |  | 35,188 |  |  | 28,640 |
Income tax provision |  | 10,827 |  |  | 8,796 |
Net Income |  | $ | 24,361 |  |  | $ | 19,844 |
Earnings per common share |  |  |  |
Basic |  | $ | 0.42 |  |  | $ | 0.38 |
Diluted |  | $ | 0.42 |  |  | $ | 0.37 |
Dividends paid per common share |  | $ | 0.30 |  |  | $ | 0.12 |
Weighted average number of common shares outstanding |  | 56,965 |  |  | 51,097 |
Weighted average number of diluted common shares outstanding |  | 56,978 |  |  | 52,433 |

See accompanying Notes to unaudited Consolidated Financial Statements.
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Columbia Banking System, Inc.
(Unaudited)

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Net income as reported |  | $ | 24,361 |  |  | $ | 19,844 |
Other comprehensive income, net of tax: |  |  |  |
Unrealized gain from securities: |  |  |  |
Net unrealized holding gain from available for sale securities arising during the period, net of tax of ($5,338) and ($4,049) |  | 9,376 |  |  | 7,119 |
Reclassification adjustment of net gain from sale of available for sale securities included in income, net of tax of $262 and $81 |  | (459 | ) |  | (142 | )
Net unrealized gain from securities, net of reclassification adjustment |  | 8,917 |  |  | 6,977 |
Pension plan liability adjustment: |  |  |  |
Net unrealized loss from unfunded defined benefit plan liability arising during the period, net of tax of $159 and $0 |  | (280 | ) |  | — |
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax of ($16) and ($13) |  | 28 |  |  | 24 |
Pension plan liability adjustment, net |  | (252 | ) |  | 24 |
Other comprehensive income |  | 8,665 |  |  | 7,001 |
Total comprehensive income |  | $ | 33,026 |  |  | $ | 26,845 |

See accompanying Notes to unaudited Consolidated Financial Statements.
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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY
Columbia Banking System, Inc.
(Unaudited)

|  | Preferred Stock |  | Common Stock |  | Retained Earnings |  | Accumulated Other Comprehensive Income (Loss) |  | Total Shareholders’ Equity
|  | Number of Shares |  | Amount |  | Number of Shares |  | Amount |
|  | (in thousands)
Balance at January 1, 2015 |  | 9 |  |  | $ | 2,217 |  |  | 57,437 |  |  | $ | 985,839 |  |  | $ | 234,498 |  |  | $ | 5,621 |  |  | $ | 1,228,175 |
Net income |  | — |  |  | — |  |  | — |  |  | — |  |  | 24,361 |  |  | — |  |  | 24,361 |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 8,665 |  |  | 8,665 |
Issuance of common stock - stock option and other plans |  | — |  |  | — |  |  | 17 |  |  | 428 |  |  | — |  |  | — |  |  | 428 |
Issuance of common stock - restricted stock awards, net of canceled awards |  | — |  |  | — |  |  | 273 |  |  | 862 |  |  | — |  |  | — |  |  | 862 |
Purchase and retirement of common stock |  | — |  |  | — |  |  | (28 | ) |  | (781 | ) |  | — |  |  | — |  |  | (781 | )
Preferred dividends |  | — |  |  | — |  |  | — |  |  | — |  |  | (31 | ) |  | — |  |  | (31 | )
Cash dividends paid on common stock |  | — |  |  | — |  |  | — |  |  | — |  |  | (17,236 | ) |  | — |  |  | (17,236 | )
Balance at March 31, 2015 |  | 9 |  |  | $ | 2,217 |  |  | 57,699 |  |  | $ | 986,348 |  |  | $ | 241,592 |  |  | $ | 14,286 |  |  | $ | 1,244,443 |
Balance at January 1, 2014 |  | 9 |  |  | $ | 2,217 |  |  | 51,265 |  |  | $ | 860,562 |  |  | $ | 202,514 |  |  | $ | (12,044 | ) |  | $ | 1,053,249 |
Net income |  | — |  |  | — |  |  | — |  |  | — |  |  | 19,844 |  |  | — |  |  | 19,844 |
Other comprehensive income |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,001 |  |  | 7,001 |
Issuance of common stock - cashless exercise of warrants |  | — |  |  | — |  |  | 1,140 |  |  | — |  |  | — |  |  | — |  |  | — |
Issuance of common stock - stock option and other plans |  | — |  |  | — |  |  | 19 |  |  | 405 |  |  | — |  |  | — |  |  | 405 |
Issuance of common stock - restricted stock awards, net of canceled awards |  | — |  |  | — |  |  | 197 |  |  | 680 |  |  | — |  |  | — |  |  | 680 |
Purchase and retirement of common stock |  | — |  |  | — |  |  | (21 | ) |  | (522 | ) |  | — |  |  | — |  |  | (522 | )
Preferred dividends |  | — |  |  | — |  |  | — |  |  | — |  |  | (12 | ) |  | — |  |  | (12 | )
Cash dividends paid on common stock |  | — |  |  | — |  |  | — |  |  | — |  |  | (6,154 | ) |  | — |  |  | (6,154 | )
Balance at March 31, 2014 |  | 9 |  |  | $ | 2,217 |  |  | 52,600 |  |  | $ | 861,125 |  |  | $ | 216,192 |  |  | $ | (5,043 | ) |  | $ | 1,074,491 |

See accompanying Notes to unaudited Consolidated Financial Statements.
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CONSOLIDATED STATEMENTS OF CASH FLOWS
Columbia Banking System, Inc.
(Unaudited)

|  | Three Months Ended March 31,
|  | 2015 |  | 2014 (1)
|  | (in thousands)
Cash Flows From Operating Activities |  |  |  |
Net Income |  | $ | 24,361 |  |  | $ | 19,844 |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |
Provision for loan and lease losses |  | 1,209 |  |  | 1,922 |
Stock-based compensation expense |  | 862 |  |  | 680 |
Depreciation, amortization and accretion |  | 7,735 |  |  | 8,972 |
Investment securities gain, net |  | (721 | ) |  | (223 | )
Net realized (gain) loss on sale of other assets |  | (306 | ) |  | 8 |
Net realized gain on sale of other real estate owned |  | (1,736 | ) |  | (1,659 | )
Write-down on other real estate owned |  | 197 |  |  | 1,580 |
Net change in: |  |  |  |
Loans held for sale |  | (2,429 | ) |  | 735 |
Interest receivable |  | (1,286 | ) |  | (1,394 | )
Interest payable |  | (79 | ) |  | (13 | )
Other assets |  | (4,531 | ) |  | 5,714 |
Other liabilities |  | 3,680 |  |  | (649 | )
Net cash provided by operating activities |  | 26,956 |  |  | 35,517 |
Cash Flows From Investing Activities |  |  |  |
Loans originated and acquired, net of principal collected |  | (12,443 | ) |  | (64,065 | )
Purchases of: |  |  |  |
Securities available for sale |  | (11,362 | ) |  | (10,787 | )
Premises and equipment |  | (4,032 | ) |  | (4,930 | )
Proceeds from: |  |  |  |
FDIC reimbursement on loss-sharing asset |  | 1,138 |  |  | 539 |
Sales of securities available for sale |  | 57,243 |  |  | 6,441 |
Principal repayments and maturities of securities available for sale |  | 54,451 |  |  | 36,530 |
Sales of loans held for investments and other assets |  | 7,745 |  |  | 337 |
Sales of other real estate and other personal property owned (1) |  | 5,067 |  |  | 11,205 |
Payments to FDIC related to loss-sharing asset |  | (479 | ) |  | (2,217 | )
Net cash provided by (used in) investing activities |  | 97,328 |  |  | (26,947 | )
Cash Flows From Financing Activities |  |  |  |
Net increase in deposits |  | 150,243 |  |  | 84,941 |
Net decrease in sweep repurchase agreements |  | (8,228 | ) |  | — |
Proceeds from: |  |  |  |
Federal Home Loan Bank advances |  | 624,000 |  |  | 587,000 |
Federal Reserve Bank borrowings |  | — |  |  | 50 |
Exercise of stock options |  | 428 |  |  | 405 |
Payments for: |  |  |  |
Repayment of Federal Home Loan Bank advances |  | (804,000 | ) |  | (617,000 | )
Repayment of Federal Reserve Bank borrowings |  | — |  |  | (50 | )
Common stock dividends |  | (17,236 | ) |  | (6,154 | )
Preferred stock dividends |  | (31 | ) |  | (12 | )
Repayment of other borrowings |  | (8,248 | ) |  | — |
Purchase and retirement of common stock |  | (781 | ) |  | (522 | )
Net cash provided by (used in) financing activities |  | (63,853 | ) |  | 48,658 |
Increase in cash and cash equivalents |  | 60,431 |  |  | 57,228 |
Cash and cash equivalents at beginning of period |  | 188,170 |  |  | 179,561 |
Cash and cash equivalents at end of period |  | $ | 248,601 |  |  | $ | 236,789 |
Supplemental Information: |  |  |  |
Cash paid during the period for: |  |  |  |
Cash paid for interest |  | $ | 1,132 |  |  | $ | 999 |
Cash paid for income tax |  | $ | 13 |  |  | $ | 10 |
Non-cash investing and financing activities |  |  |  |
Loans transferred to other real estate owned |  | $ | 4,692 |  |  | $ | 5,751 |

__________
(1) Reclassified to conform to the current period’s presentation. The reclassification was limited to removing the separate line item for “Sales of covered other real estate owned” and including the prior period activity in the line item for sales of other real estate and other personal property owned.
See accompanying Notes to unaudited Consolidated Financial Statements.
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NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS
Columbia Banking System, Inc.

1. | Basis of Presentation and Significant Accounting Policies

Basis of Presentation
The interim unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with instructions to Form 10-Q and Article 10 of Regulation S-X. The consolidated financial statements include the accounts of Columbia Banking System, Inc. (“we”, “our”, “Columbia” or the “Company”) and its subsidiaries, including its wholly owned banking subsidiary Columbia State Bank (“Columbia Bank” or the “Bank”) and West Coast Trust Company, Inc. (“West Coast Trust”). All intercompany transactions and accounts have been eliminated in consolidation. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of results to be anticipated for the year ending December 31, 2015. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2014 Annual Report on Form 10-K.
Due to the timing of the acquisition of Intermountain Community Bancorp (“Intermountain”) on November 1, 2014, our results of operations for the three month period ended March 31, 2015 include the acquisition for the entire three month period, however the prior year period’s results of operations do not include the acquisition. See Note 3, Business Combinations, for further information regarding this acquisition.
Significant Accounting Policies
The significant accounting policies used in preparation of our consolidated financial statements are disclosed in our 2014 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2014 Form 10-K disclosure for the year ended December 31, 2014.

2. | Accounting Pronouncements Recently Issued

In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-05, Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The Update provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The new guidance does not change the accounting for a customer’s accounting for service contracts. ASU No. 2015-05 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
In June 2014, the FASB issued ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The Update changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with accounting for other repurchase agreements. Additionally, the amendment requires new disclosures on transfers accounted for as sales in transactions that are economically similar to repurchase agreements and requires increased transparency on collateral pledged in secured borrowings. The amendments in this update will be effective for the first interim or annual period beginning after December 31, 2014, with the exception of the collateral disclosures which will be effective for interim periods beginning after March 15, 2015. Early application is not permitted. The Company does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
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3. | Business Combinations

On November 1, 2014, the Company completed its acquisition of Intermountain. The Company paid $131.9 million in total consideration to acquire 100% of the equity interests of Intermountain. The primary reason for the acquisition was to expand the Company’s geographic footprint into the state of Idaho, consistent with its ongoing growth strategy.
The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of the November 1, 2014 acquisition date. Initial accounting for deferred taxes was incomplete as of March 31, 2015. The amount currently recognized in the financial statements has been determined provisionally as the final Intermountain Community Bancorp tax return has not yet been completed. The fair value of the net assets acquired totaled $93.4 million, including $736.8 million of deposits, $502.6 million of loans and $10.9 million of other intangible assets. Goodwill of $38.6 million was recorded as part of the acquisition. The goodwill is not deductible for income tax purposes.
The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period January 1, 2015 to March 31, 2015. Disclosure of the amount of Intermountain’s revenue and net income (excluding integration costs) included in Columbia’s consolidated income statement is impracticable due to the integration of the operations and accounting for this acquisition.
For illustrative purposes only, the following table presents certain unaudited pro forma information for the three month period ended March 31, 2014. This unaudited pro forma information was calculated as if Intermountain had been acquired as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information combines the historical results of Intermountain with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective period. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth, as a result of the acquisition which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.

|  | Unaudited Pro Forma
|  | Three Months Ended March 31,
|  | 2014
|  | (in thousands except per share)
Total revenues (net interest income plus noninterest income) |  | $ | 97,488 |
Net income |  | $ | 21,078 |
Earnings per share - basic |  | $ | 0.38 |
Earnings per share - diluted |  | $ | 0.37 |

In connection with the Intermountain acquisition, Columbia recognized $2.9 million in acquisition-related expenses for the three month period ended March 31, 2015 and recognized no acquisition-related expenses for the three month period ended March 31, 2014. In addition, related to the acquisition of West Coast Bancorp (“West Coast”) which was completed on April 1, 2013, Columbia recognized $72 thousand and $966 thousand in acquisition-related expenses for the three month periods ended March 31, 2015 and 2014, respectively.
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The following table shows the impact of the acquisition-related expenses related to the acquisition of Intermountain for the three months ended March 31, 2015 to the various components of noninterest expense:

|  | Three Months Ended March 31,
|  | 2015
|  | (in thousands)
Noninterest Expense |  |
Compensation and employee benefits |  | $ | 273 |
Occupancy |  | 499 |
Advertising and promotion |  | 96 |
Data processing and communications |  | 1,558 |
Legal and professional fees |  | 385 |
Other |  | 91 |
Total impact of acquisition-related costs to noninterest expense |  | $ | 2,902 |

See Note 2, Business Combinations, in Item 8 of our 2014 Form 10-K for additional details related to the Intermountain acquisition.

4. | Securities

The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:

|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (in thousands)
March 31, 2015 |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 1,093,576 |  |  | $ | 13,765 |  |  | $ | (4,641 | ) |  | $ | 1,102,700 |
State and municipal securities |  | 486,969 |  |  | 15,434 |  |  | (732 | ) |  | 501,671 |
U.S. government agency and government-sponsored enterprise securities |  | 375,230 |  |  | 2,551 |  |  | (983 | ) |  | 376,798 |
U.S. government securities |  | 20,918 |  |  | — |  |  | (140 | ) |  | 20,778 |
Other securities |  | 5,284 |  |  | 40 |  |  | (112 | ) |  | 5,212 |
Total |  | $ | 1,981,977 |  |  | $ | 31,790 |  |  | $ | (6,608 | ) |  | $ | 2,007,159 |
December 31, 2014 |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 1,160,378 |  |  | $ | 10,219 |  |  | $ | (8,210 | ) |  | $ | 1,162,387 |
State and municipal securities |  | 483,578 |  |  | 14,432 |  |  | (1,526 | ) |  | 496,484 |
U.S. government agency and government-sponsored enterprise securities |  | 416,919 |  |  | 856 |  |  | (4,069 | ) |  | 413,706 |
U.S. government securities |  | 20,910 |  |  | — |  |  | (411 | ) |  | 20,499 |
Other securities |  | 5,284 |  |  | 20 |  |  | (123 | ) |  | 5,181 |
Total |  | $ | 2,087,069 |  |  | $ | 25,527 |  |  | $ | (14,339 | ) |  | $ | 2,098,257 |

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Proceeds from sales of securities available-for-sale were $57.2 million and $6.4 million for the three months ended March 31, 2015 and 2014, respectively. The following table provides the gross realized gains and losses on the sales of securities for the periods indicated:

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Gross realized gains |  | $ | 730 |  |  | $ | 223 |
Gross realized losses |  | (9 | ) |  | — |
Net realized gains |  | $ | 721 |  |  | $ | 223 |

The scheduled contractual maturities of investment securities available for sale at March 31, 2015 are presented as follows:

|  | March 31, 2015
|  | Amortized Cost |  | Fair Value
|  | (in thousands)
Due within one year |  | $ | 15,480 |  |  | $ | 15,601 |
Due after one year through five years |  | 404,752 |  |  | 406,989 |
Due after five years through ten years |  | 526,230 |  |  | 534,584 |
Due after ten years |  | 1,030,231 |  |  | 1,044,773 |
Other securities with no stated maturity |  | 5,284 |  |  | 5,212 |
Total investment securities available-for-sale |  | $ | 1,981,977 |  |  | $ | 2,007,159 |

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

|  | March 31, 2015
|  | (in thousands)
Washington and Oregon State to secure public deposits |  | $ | 323,771 |
Federal Reserve Bank to secure borrowings |  | 36,945 |
Other securities pledged |  | 156,385 |
Total securities pledged as collateral |  | $ | 517,101 |

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The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2015 and December 31, 2014:

|  | Less than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (in thousands)
March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 94,304 |  |  | $ | (634 | ) |  | $ | 213,050 |  |  | $ | (4,007 | ) |  | $ | 307,354 |  |  | $ | (4,641 | )
State and municipal securities |  | 45,809 |  |  | (227 | ) |  | 31,597 |  |  | (505 | ) |  | 77,406 |  |  | (732 | )
U.S. government agency and government-sponsored enterprise securities |  | 999 |  |  | (1 | ) |  | 178,013 |  |  | (982 | ) |  | 179,012 |  |  | (983 | )
U.S. government securities |  | 1,050 |  |  | (1 | ) |  | 19,728 |  |  | (139 | ) |  | 20,778 |  |  | (140 | )
Other securities |  | — |  |  | — |  |  | 2,843 |  |  | (112 | ) |  | 2,843 |  |  | (112 | )
Total |  | $ | 142,162 |  |  | $ | (863 | ) |  | $ | 445,231 |  |  | $ | (5,745 | ) |  | $ | 587,393 |  |  | $ | (6,608 | )
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 258,825 |  |  | $ | (1,287 | ) |  | $ | 279,015 |  |  | $ | (6,924 | ) |  | $ | 537,840 |  |  | $ | (8,211 | )
State and municipal securities |  | 71,026 |  |  | (543 | ) |  | 44,148 |  |  | (982 | ) |  | 115,174 |  |  | (1,525 | )
U.S. government agency and government-sponsored enterprise securities |  | 105,250 |  |  | (518 | ) |  | 216,221 |  |  | (3,551 | ) |  | 321,471 |  |  | (4,069 | )
U.S. government securities |  | — |  |  | — |  |  | 19,450 |  |  | (411 | ) |  | 19,450 |  |  | (411 | )
Other securities |  | 2,313 |  |  | (2 | ) |  | 2,834 |  |  | (121 | ) |  | 5,147 |  |  | (123 | )
Total |  | $ | 437,414 |  |  | $ | (2,350 | ) |  | $ | 561,668 |  |  | $ | (11,989 | ) |  | $ | 999,082 |  |  | $ | (14,339 | )

At March 31, 2015, there were 77 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 34 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2015.
At March 31, 2015, there were 66 state and municipal government securities in an unrealized loss position, of which 32 were in a continuous loss position for 12 months or more. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of March 31, 2015, none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2015.
At March 31, 2015, there were 18 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, 14 of which were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2015.
At March 31, 2015, there were four U.S. government securities in an unrealized loss position, two of which were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell
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these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2015.
At March 31, 2015, there was one other security in an unrealized loss position, which was in a continuous unrealized loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates and the additional risk premium investors are demanding for investment securities with these characteristics. The Company does not consider this investment to be other-than-temporarily impaired at March 31, 2015 as it has the intent and ability to hold the investment for sufficient time to allow for recovery in the market value.

5. | Loans

The Company’s loan portfolio includes originated and purchased loans. Originated loans and purchased loans for which there was no evidence of credit deterioration at their acquisition date and it was probable that we would be able to collect all contractually required payments are referred to collectively as loans, excluding purchased credit impaired loans. Purchased loans for which there was, at acquisition date, evidence of credit deterioration since their origination and it was probable that we would be unable to collect all contractually required payments are referred to as purchased credit impaired loans, or “PCI loans.”
The following is an analysis of the loan portfolio by major types of loans (net of unearned income):

|  | March 31, 2015 |  | December 31, 2014
|  | Loans, excluding PCI loans |  | PCI Loans |  | Total |  | Loans, excluding PCI loans |  | PCI Loans |  | Total
|  | (in thousands)
Commercial business |  | $ | 2,139,873 |  |  | $ | 46,335 |  |  | $ | 2,186,208 |  |  | $ | 2,119,565 |  |  | $ | 44,505 |  |  | $ | 2,164,070 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 173,739 |  |  | 26,601 |  |  | 200,340 |  |  | 175,571 |  |  | 26,993 |  |  | 202,564 |
Commercial and multifamily residential |  | 2,374,454 |  |  | 118,230 |  |  | 2,492,684 |  |  | 2,363,541 |  |  | 128,769 |  |  | 2,492,310 |
Total real estate |  | 2,548,193 |  |  | 144,831 |  |  | 2,693,024 |  |  | 2,539,112 |  |  | 155,762 |  |  | 2,694,874 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 124,017 |  |  | 3,797 |  |  | 127,814 |  |  | 116,866 |  |  | 4,021 |  |  | 120,887 |
Commercial and multifamily residential |  | 119,880 |  |  | 2,238 |  |  | 122,118 |  |  | 134,443 |  |  | 2,321 |  |  | 136,764 |
Total real estate construction |  | 243,897 |  |  | 6,035 |  |  | 249,932 |  |  | 251,309 |  |  | 6,342 |  |  | 257,651 |
Consumer |  | 352,960 |  |  | 22,638 |  |  | 375,598 |  |  | 364,182 |  |  | 23,975 |  |  | 388,157 |
Less: Net unearned income |  | (53,867 | ) |  | — |  |  | (53,867 | ) |  | (59,374 | ) |  | — |  |  | (59,374 | )
Total loans, net of unearned income |  | 5,231,056 |  |  | 219,839 |  |  | 5,450,895 |  |  | 5,214,794 |  |  | 230,584 |  |  | 5,445,378 |
Less: Allowance for loan and lease losses |  | (53,703 | ) |  | (16,531 | ) |  | (70,234 | ) |  | (53,233 | ) |  | (16,336 | ) |  | (69,569 | )
Total loans, net |  | $ | 5,177,353 |  |  | $ | 203,308 |  |  | $ | 5,380,661 |  |  | $ | 5,161,561 |  |  | $ | 214,248 |  |  | $ | 5,375,809 |
Loans held for sale |  | $ | 3,545 |  |  | $ | — |  |  | $ | 3,545 |  |  | $ | 1,116 |  |  | $ | — |  |  | $ | 1,116 |

At March 31, 2015 and December 31, 2014, the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.
The Company has made loans to executive officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans was $12.7 million at March 31, 2015 and $13.2 million at December 31, 2014. During the first three months of 2015, there were no advances and repayments totaled $430 thousand.
At March 31, 2015 and December 31, 2014, $1.30 billion and $1.08 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank of Seattle (“FHLB”) borrowings and additional borrowing capacity. The Company has also pledged $47.0 million and $46.0 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at March 31, 2015 and December 31, 2014, respectively.
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The following is an analysis of nonaccrual loans as of March 31, 2015 and December 31, 2014:

|  | March 31, 2015 |  | December 31, 2014
|  | Recorded Investment Nonaccrual Loans |  | Unpaid Principal Balance Nonaccrual Loans |  | Recorded Investment Nonaccrual Loans |  | Unpaid Principal Balance Nonaccrual Loans
|  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |
Secured |  | $ | 17,240 |  |  | $ | 20,573 |  |  | $ | 16,552 |  |  | $ | 21,453 |
Unsecured |  | 189 |  |  | 211 |  |  | 247 |  |  | 269 |
Real estate: |  |  |  |  |  |  |  |
One-to-four family residential |  | 4,429 |  |  | 6,109 |  |  | 2,822 |  |  | 5,680 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |
Commercial land |  | 1,616 |  |  | 1,560 |  |  | 821 |  |  | 1,113 |
Income property |  | 887 |  |  | 887 |  |  | 3,200 |  |  | 5,521 |
Owner occupied |  | 1,995 |  |  | 2,036 |  |  | 3,826 |  |  | 5,837 |
Real estate construction: |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |
Land and acquisition |  | 871 |  |  | 871 |  |  | 95 |  |  | 112 |
Residential construction |  | 1,263 |  |  | 1,263 |  |  | 370 |  |  | 370 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |
Owner occupied |  | 470 |  |  | 489 |  |  | 480 |  |  | 489 |
Consumer |  | 2,868 |  |  | 3,799 |  |  | 2,939 |  |  | 3,930 |
Total |  | $ | 31,828 |  |  | $ | 37,798 |  |  | $ | 31,352 |  |  | $ | 44,774 |

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Loans, excluding purchased credit impaired loans
The following is an aging of the recorded investment of the loan portfolio as of March 31, 2015 and December 31, 2014:

|  | Current Loans |  | 30 - 59 Days Past Due |  | 60 - 89 Days Past Due |  | Greater than 90 Days Past Due |  | Total Past Due |  | Nonaccrual Loans |  | Total Loans
March 31, 2015 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 2,024,277 |  |  | $ | 11,910 |  |  | $ | 1,874 |  |  | $ | 58 |  |  | $ | 13,842 |  |  | $ | 17,240 |  |  | $ | 2,055,359 |
Unsecured |  | 78,351 |  |  | 492 |  |  | 120 |  |  | 67 |  |  | 679 |  |  | 189 |  |  | 79,219 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 164,962 |  |  | 771 |  |  | 124 |  |  | 21 |  |  | 916 |  |  | 4,429 |  |  | 170,307 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 186,904 |  |  | 4,303 |  |  | 355 |  |  | 264 |  |  | 4,922 |  |  | 1,616 |  |  | 193,442 |
Income property |  | 1,305,595 |  |  | 2,502 |  |  | 560 |  |  | — |  |  | 3,062 |  |  | 887 |  |  | 1,309,544 |
Owner occupied |  | 841,551 |  |  | 2,206 |  |  | 435 |  |  | — |  |  | 2,641 |  |  | 1,995 |  |  | 846,187 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 15,860 |  |  | 67 |  |  | — |  |  | — |  |  | 67 |  |  | 871 |  |  | 16,798 |
Residential construction |  | 104,378 |  |  | — |  |  | — |  |  | 4 |  |  | 4 |  |  | 1,263 |  |  | 105,645 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 62,958 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 62,958 |
Owner occupied |  | 54,969 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 470 |  |  | 55,439 |
Consumer |  | 331,566 |  |  | 1,509 |  |  | 193 |  |  | 22 |  |  | 1,724 |  |  | 2,868 |  |  | 336,158 |
Total |  | $ | 5,171,371 |  |  | $ | 23,760 |  |  | $ | 3,661 |  |  | $ | 436 |  |  | $ | 27,857 |  |  | $ | 31,828 |  |  | $ | 5,231,056 |
|  | Current Loans |  | 30 - 59 Days Past Due |  | 60 - 89 Days Past Due |  | Greater than 90 Days Past Due |  | Total Past Due |  | Nonaccrual Loans |  | Total Loans
December 31, 2014 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 2,004,418 |  |  | $ | 5,137 |  |  | $ | 6,149 |  |  | $ | 1,372 |  |  | $ | 12,658 |  |  | $ | 16,552 |  |  | $ | 2,033,628 |
Unsecured |  | 79,661 |  |  | 185 |  |  | — |  |  | — |  |  | 185 |  |  | 247 |  |  | 80,093 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 167,197 |  |  | 1,700 |  |  | 45 |  |  | — |  |  | 1,745 |  |  | 2,822 |  |  | 171,764 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 187,470 |  |  | 1,454 |  |  | 34 |  |  | — |  |  | 1,488 |  |  | 821 |  |  | 189,779 |
Income property |  | 1,294,982 |  |  | 3,031 |  |  | 786 |  |  | — |  |  | 3,817 |  |  | 3,200 |  |  | 1,301,999 |
Owner occupied |  | 839,689 |  |  | 937 |  |  | 289 |  |  | — |  |  | 1,226 |  |  | 3,826 |  |  | 844,741 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 15,462 |  |  | 953 |  |  | — |  |  | — |  |  | 953 |  |  | 95 |  |  | 16,510 |
Residential construction |  | 97,821 |  |  | 326 |  |  | — |  |  | 4 |  |  | 330 |  |  | 370 |  |  | 98,521 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 73,783 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 73,783 |
Owner occupied |  | 57,470 |  |  | — |  |  | 994 |  |  | — |  |  | 994 |  |  | 480 |  |  | 58,944 |
Consumer |  | 341,032 |  |  | 933 |  |  | 118 |  |  | 10 |  |  | 1,061 |  |  | 2,939 |  |  | 345,032 |
Total |  | $ | 5,158,985 |  |  | $ | 14,656 |  |  | $ | 8,415 |  |  | $ | 1,386 |  |  | $ | 24,457 |  |  | $ | 31,352 |  |  | $ | 5,214,794 |

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The following is an analysis of impaired loans as of March 31, 2015 and December 31, 2014:

|  | Recorded Investment of Loans Collectively Measured for Contingency Provision |  | Recorded Investment of Loans Individually Measured for Specific Impairment |  | Impaired Loans With Recorded Allowance |  | Impaired Loans Without Recorded Allowance
|  | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Recorded Investment |  | Unpaid Principal Balance
March 31, 2015 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 2,044,486 |  |  | $ | 10,873 |  |  | $ | 96 |  |  | $ | 96 |  |  | $ | 24 |  |  | $ | 10,777 |  |  | $ | 12,986 |
Unsecured |  | 79,219 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 166,129 |  |  | 4,178 |  |  | 420 |  |  | 461 |  |  | 115 |  |  | 3,758 |  |  | 4,220 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 192,972 |  |  | 470 |  |  | — |  |  | — |  |  | — |  |  | 470 |  |  | 470 |
Income property |  | 1,307,556 |  |  | 1,988 |  |  | — |  |  | — |  |  | — |  |  | 1,988 |  |  | 2,355 |
Owner occupied |  | 839,157 |  |  | 7,030 |  |  | 578 |  |  | 578 |  |  | 24 |  |  | 6,452 |  |  | 8,944 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 15,818 |  |  | 980 |  |  | 109 |  |  | 108 |  |  | 67 |  |  | 871 |  |  | 871 |
Residential construction |  | 104,752 |  |  | 893 |  |  | — |  |  | — |  |  | — |  |  | 893 |  |  | 893 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 62,958 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Owner occupied |  | 55,439 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Consumer |  | 335,474 |  |  | 684 |  |  | — |  |  | — |  |  | — |  |  | 684 |  |  | 895 |
Total |  | $ | 5,203,960 |  |  | $ | 27,096 |  |  | $ | 1,203 |  |  | $ | 1,243 |  |  | $ | 230 |  |  | $ | 25,893 |  |  | $ | 31,634 |
|  | Recorded Investment of Loans Collectively Measured for Contingency Provision |  | Recorded Investment of Loans Individually Measured for Specific Impairment |  | Impaired Loans With Recorded Allowance |  | Impaired Loans Without Recorded Allowance
|  |  |  | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Recorded Investment |  | Unpaid Principal Balance
December 31, 2014 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 2,023,104 |  |  | $ | 10,524 |  |  | $ | 99 |  |  | $ | 99 |  |  | $ | 25 |  |  | $ | 10,425 |  |  | $ | 12,410 |
Unsecured |  | 80,091 |  |  | 2 |  |  | 2 |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 169,619 |  |  | 2,145 |  |  | 424 |  |  | 465 |  |  | 120 |  |  | 1,721 |  |  | 2,370 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 189,779 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Income property |  | 1,295,650 |  |  | 6,349 |  |  | — |  |  | — |  |  | — |  |  | 6,349 |  |  | 10,720 |
Owner occupied |  | 835,895 |  |  | 8,846 |  |  | 582 |  |  | 582 |  |  | 27 |  |  | 8,264 |  |  | 12,732 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 16,401 |  |  | 109 |  |  | 109 |  |  | 109 |  |  | 67 |  |  | — |  |  | — |
Residential construction |  | 98,521 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 73,783 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Owner occupied |  | 58,944 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Consumer |  | 344,908 |  |  | 124 |  |  | — |  |  | — |  |  | — |  |  | 124 |  |  | 201 |
Total |  | $ | 5,186,695 |  |  | $ | 28,099 |  |  | $ | 1,216 |  |  | $ | 1,257 |  |  | $ | 241 |  |  | $ | 26,883 |  |  | $ | 38,433 |

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The following table provides additional information on impaired loans for the three month periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | Average Recorded Investment Impaired Loans |  | Interest Recognized on Impaired Loans |  | Average Recorded Investment Impaired Loans |  | Interest Recognized on Impaired Loans
|  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |
Secured |  | $ | 10,698 |  |  | $ | 7 |  |  | $ | 6,232 |  |  | $ | 17 |
Unsecured |  | 1 |  |  | — |  |  | 31 |  |  | — |
Real estate: |  |  |  |  |  |  |  |
One-to-four family residential |  | 3,162 |  |  | 13 |  |  | 1,856 |  |  | 13 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |
Commercial land |  | 235 |  |  | — |  |  | 111 |  |  | — |
Income property |  | 4,168 |  |  | 10 |  |  | 6,436 |  |  | 62 |
Owner occupied |  | 7,938 |  |  | 234 |  |  | 10,140 |  |  | 241 |
Real estate construction: |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |
Land and acquisition |  | 544 |  |  | 1 |  |  | 1,569 |  |  | 1 |
Residential construction |  | 446 |  |  | — |  |  | — |  |  | — |
Consumer |  | 404 |  |  | 2 |  |  | 163 |  |  | 2 |
Total |  | $ | 27,596 |  |  | $ | 267 |  |  | $ | 26,538 |  |  | $ | 336 |

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There were no troubled debt restructurings (“TDR”) during the three months ended March 31, 2015. The following is an analysis of loans classified as TDR during the three months ended March 31, 2014:

|  | Three months ended March 31, 2014
|  | Number of TDR Modifications |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment
|  | (dollars in thousands)
Commercial business: |  |  |  |  |  |
Secured |  | 2 |  |  | $ | 546 |  |  | $ | 546 |
Real estate: |  |  |  |  |  |
One-to-four family residential |  | 2 |  |  | 494 |  |  | 494 |
Commercial and multifamily residential: |  |  |  |  |  |
Income property |  | 1 |  |  | 143 |  |  | 126 |
Total |  | 5 |  |  | $ | 1,183 |  |  | $ | 1,166 |

The Company’s loans classified as TDR are loans that have been modified or the borrower has been granted special concessions due to financial difficulties that, if not for the challenges of the borrower, the Company would not otherwise consider. The TDR modifications or concessions are made to increase the likelihood that these borrowers with financial difficulties will be able to satisfy their debt obligations as amended. The concessions granted in the restructurings completed in the three month period ending March 31, 2014 largely consisted of maturity extensions, interest rate modifications or a combination of both. In limited circumstances, a reduction in the principal balance of the loan could also be made as a concession. Credit losses for loans classified as TDR are measured on the same basis as impaired loans. For impaired loans, an allowance is established when the collateral value less selling costs (or discounted cash flows or observable market price) of the impaired loan is lower than the recorded investment of that loan.
The Company had no commitments to lend additional funds on loans classified as TDR as of March 31, 2015 and December 31, 2014. The Company did not have any loans modified as TDR that defaulted within twelve months of being modified as TDR during the three month periods ended March 31, 2015 and 2014.
Purchased Credit Impaired Loans (“PCI Loans”)
PCI loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis.
Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows.
Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix. The transition matrix is a matrix of probability values that specifies the probability of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages and recovery lags are based upon the collateral within the loan pools.
The excess of cash flows expected to be collected over the initial fair value of purchased credit impaired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates.
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The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of March 31, 2015 and December 31, 2014:

|  | March 31, 2015 |  | December 31, 2014
|  | (in thousands)
Commercial business |  | $ | 52,115 |  |  | $ | 50,334 |
Real estate: |  |  |  |
One-to-four family residential |  | 31,127 |  |  | 31,981 |
Commercial and multifamily residential |  | 127,952 |  |  | 140,398 |
Total real estate |  | 159,079 |  |  | 172,379 |
Real estate construction: |  |  |  |
One-to-four family residential |  | 4,026 |  |  | 4,353 |
Commercial and multifamily residential |  | 2,501 |  |  | 2,588 |
Total real estate construction |  | 6,527 |  |  | 6,941 |
Consumer |  | 25,390 |  |  | 26,814 |
Subtotal of PCI loans |  | 243,111 |  |  | 256,468 |
Less: |  |  |  |
Valuation discount resulting from acquisition accounting |  | 23,272 |  |  | 25,884 |
Allowance for loan losses |  | 16,531 |  |  | 16,336 |
PCI loans, net of allowance for loan losses |  | $ | 203,308 |  |  | $ | 214,248 |

The following table shows the changes in accretable yield for PCI loans for the three months ended March 31, 2015 and 2014:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance at beginning of period |  | $ | 73,849 |  |  | $ | 103,907 |
Accretion |  | (6,319 | ) |  | (10,569 | )
Disposals |  | (1,093 | ) |  | (2,826 | )
Reclassifications from nonaccretable difference |  | 2,289 |  |  | 11,031 |
Balance at end of period |  | $ | 68,726 |  |  | $ | 101,543 |

6. | Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit

Loans, excluding PCI loans
We maintain an allowance for loan and lease losses (“ALLL”) to absorb losses inherent in the loan portfolio. The size of the ALLL is determined through quarterly assessments of the probable estimated losses in the loan portfolio. Our methodology for making such assessments and determining the adequacy of the ALLL includes the following key elements:

1. | General valuation allowance consistent with the Contingencies topic of the FASB ASC.

2. | Classified loss reserves on specific relationships. Specific allowances for identified problem loans are determined in accordance with the Receivables topic of the FASB ASC.

3. | The unallocated allowance provides for other factors inherent in our loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed quarterly based on trends in credit losses, the results of credit reviews and overall economic trends.

The general valuation allowance is calculated quarterly using quantitative and qualitative information about specific loan classes. The minimum required level with respect to which an entity develops a methodology to determine its ALLL is by general categories of loans, such as commercial business, real estate, and consumer. However, the Company’s methodology in determining its ALLL is prepared in a more detailed manner at the loan class level, utilizing specific categories such as commercial business secured, commercial business unsecured, real estate commercial land, and real estate income property multifamily. The quantitative information uses historical losses from a specific loan class and incorporates the loan’s risk rating migration from origination to the point of loss based upon the consideration of an appropriate look back period.
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A loan’s risk rating is primarily determined based upon the borrower’s ability to fulfill its debt obligation from a cash flow perspective. In the event there is financial deterioration of the borrower, the borrower’s other sources of income or repayment are also considered, including recent appraisal values for collateral dependent loans. The qualitative information takes into account general economic and business conditions affecting our marketplace, seasoning of the loan portfolio, duration of the business cycle, etc. to ensure our methodologies reflect the current economic environment and other factors as using historical loss information exclusively may not give an accurate estimate of inherent losses within the Company’s loan portfolio.
When a loan is deemed to be impaired, the Company has to determine if a specific valuation allowance is required for that loan. The specific valuation allowance is a reserve, calculated at the individual loan level, for each loan determined to be both, impaired and containing a value less than its recorded investment. The Company measures the impairment based on the discounted expected future cash flows, observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent or if foreclosure is probable. The specific reserve for each loan is equal to the difference between the recorded investment in the loan and its determined impairment value.
The ALLL is increased by provisions for loan and lease losses (“provision”) charged to expense, and is reduced by loans charged off, net of recoveries or a recovery of previous provisions. While the Company’s management believes the best information available is used to determine the ALLL, changes in market conditions could result in adjustments to the ALLL, affecting net income, if circumstances differ from the assumptions used in determining the ALLL.
We have used the same methodology for ALLL calculations during the three months ended March 31, 2015 and 2014. Adjustments to the percentages of the ALLL allocated to loan categories are made based on trends with respect to delinquencies and problem loans within each class of loans. The Company reviews the ALLL quantitative and qualitative methodology on a quarterly basis and makes adjustments when appropriate. The Company continues to strive towards maintaining a conservative approach to credit quality and will continue to make revisions to our ALLL as necessary to maintain adequate reserves. The Company carefully monitors the loan portfolio and continues to emphasize the importance of credit quality.
Once it is determined that all or a portion of a loan balance is uncollectable, and the amount can be reasonably estimated, the uncollectable portion of the loan is charged-off.
PCI Loans
Purchased credit impaired loans that have common risk characteristics are aggregated into loan pools. When required, we record impairment, at the pool-level, to adjust the pool’s carrying value to its net present value of expected future cash flows. Quarterly, we re-measure expected loan pool cash flows. If, due to credit deterioration, the present value of expected cash flows is less than carrying value, we reduce the loan pool’s carrying value by adjusting the ALLL with an impairment charge to earnings which is recorded as provision for loan losses. If credit quality improves and the present value of expected cash flows exceeds carrying value, we increase the loan pool’s carrying value by recapturing previously recorded ALLL, if any. See Note 5, Loans, for further discussion of the accounting for PCI loans.
Credit losses attributable to draws on purchased credit impaired loans, advanced subsequent to the loan purchase date, are accounted for under ASC 450-20 and those amounts are also subject to the Company’s internal and external credit review. An ALLL is estimated in a similar manner as loans, excluding PCI loans, and a provision for loan losses is charged to earnings as necessary.
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The following tables show a detailed analysis of the ALLL for the three months ended March 31, 2015 and 2014:

|  | Beginning Balance |  | Charge-offs |  | Recoveries |  | Provision (Recovery) |  | Ending Balance |  | Specific Reserve |  | General Allocation
Three months ended March 31, 2015 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 25,923 |  |  | $ | (1,386 | ) |  | $ | 512 |  |  | $ | 712 |  |  | $ | 25,761 |  |  | $ | 24 |  |  | $ | 25,737 |
Unsecured |  | 927 |  |  | (40 | ) |  | 106 |  |  | 19 |  |  | 1,012 |  |  | — |  |  | 1,012 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 2,281 |  |  | (8 | ) |  | 12 |  |  | (921 | ) |  | 1,364 |  |  | 115 |  |  | 1,249 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 799 |  |  | — |  |  | — |  |  | 28 |  |  | 827 |  |  | — |  |  | 827 |
Income property |  | 9,159 |  |  | — |  |  | 3,252 |  |  | (3,971 | ) |  | 8,440 |  |  | — |  |  | 8,440 |
Owner occupied |  | 5,007 |  |  | — |  |  | 9 |  |  | 596 |  |  | 5,612 |  |  | 24 |  |  | 5,588 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 1,197 |  |  | — |  |  | 2 |  |  | (173 | ) |  | 1,026 |  |  | 67 |  |  | 959 |
Residential construction |  | 1,860 |  |  | — |  |  | 26 |  |  | (96 | ) |  | 1,790 |  |  | — |  |  | 1,790 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 622 |  |  | — |  |  | 3 |  |  | 202 |  |  | 827 |  |  | — |  |  | 827 |
Owner occupied |  | 434 |  |  | — |  |  | — |  |  | 65 |  |  | 499 |  |  | — |  |  | 499 |
Consumer |  | 3,180 |  |  | (891 | ) |  | 273 |  |  | 273 |  |  | 2,835 |  |  | — |  |  | 2,835 |
Purchased credit impaired |  | 16,336 |  |  | (4,100 | ) |  | 1,686 |  |  | 2,609 |  |  | 16,531 |  |  | — |  |  | 16,531 |
Unallocated |  | 1,844 |  |  | — |  |  | — |  |  | 1,866 |  |  | 3,710 |  |  | — |  |  | 3,710 |
Total |  | $ | 69,569 |  |  | $ | (6,425 | ) |  | $ | 5,881 |  |  | $ | 1,209 |  |  | $ | 70,234 |  |  | $ | 230 |  |  | $ | 70,004 |

|  | Beginning Balance |  | Charge-offs |  | Recoveries |  | Provision (Recovery) |  | Ending Balance |  | Specific Reserve |  | General Allocation
Three months ended March 31, 2014 |  | (in thousands)
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 31,027 |  |  | $ | (198 | ) |  | $ | 448 |  |  | $ | (2,476 | ) |  | $ | 28,801 |  |  | $ | 1,521 |  |  | $ | 27,280 |
Unsecured |  | 696 |  |  | (35 | ) |  | 42 |  |  | 43 |  |  | 746 |  |  | 27 |  |  | 719 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 1,252 |  |  | (207 | ) |  | 28 |  |  | 121 |  |  | 1,194 |  |  | 133 |  |  | 1,061 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 489 |  |  | — |  |  | 17 |  |  | 73 |  |  | 579 |  |  | — |  |  | 579 |
Income property |  | 9,234 |  |  | — |  |  | 13 |  |  | 860 |  |  | 10,107 |  |  | — |  |  | 10,107 |
Owner occupied |  | 3,605 |  |  | (1,023 | ) |  | 9 |  |  | 1,969 |  |  | 4,560 |  |  | 38 |  |  | 4,522 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 610 |  |  | — |  |  | 39 |  |  | (69 | ) |  | 580 |  |  | 71 |  |  | 509 |
Residential construction |  | 822 |  |  | — |  |  | 3 |  |  | (129 | ) |  | 696 |  |  | — |  |  | 696 |
Commercial & multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 285 |  |  | — |  |  | — |  |  | 35 |  |  | 320 |  |  | — |  |  | 320 |
Owner occupied |  | 58 |  |  | — |  |  | — |  |  | 96 |  |  | 154 |  |  | — |  |  | 154 |
Consumer |  | 2,547 |  |  | (727 | ) |  | 253 |  |  | 564 |  |  | 2,637 |  |  | 3 |  |  | 2,634 |
Purchased credit impaired |  | 20,174 |  |  | (4,273 | ) |  | 1,806 |  |  | 2,422 |  |  | 20,129 |  |  | — |  |  | 20,129 |
Unallocated |  | 1,655 |  |  | — |  |  | — |  |  | (1,587 | ) |  | 68 |  |  | — |  |  | 68 |
Total |  | $ | 72,454 |  |  | $ | (6,463 | ) |  | $ | 2,658 |  |  | $ | 1,922 |  |  | $ | 70,571 |  |  | $ | 1,793 |  |  | $ | 68,778 |

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Changes in the allowance for unfunded commitments and letters of credit, a component of other liabilities in the consolidated balance sheet, are summarized as follows:

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance at beginning of period |  | $ | 2,655 |  |  | $ | 2,505 |
Net changes in the allowance for unfunded commitments and letters of credit |  | — |  |  | (50 | )
Balance at end of period |  | $ | 2,655 |  |  | $ | 2,455 |

Risk Elements
The extension of credit in the form of loans or other credit products to individuals and businesses is one of our principal business activities. Our policies and applicable laws and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.
Risk ratings are reviewed and updated whenever appropriate, with more periodic reviews as the risk and dollar value of loss on the loan increases. In the event full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan.
Pass loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special mention loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reported as classified loans in our ALLL analysis. We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. Substandard loans reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful loans have a high probability of loss, however, the amount of loss has not yet been determined. Loss loans are considered uncollectable and when identified, are charged off.
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The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans, as of March 31, 2015 and December 31, 2014:

|  | Pass |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
March 31, 2015 |  | (in thousands)
Loans, excluding PCI loans: |  |  |  |  |  |  |  |  |  |  |  |
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 1,995,680 |  |  | $ | 19,210 |  |  | $ | 40,469 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,055,359 |
Unsecured |  | 78,498 |  |  | — |  |  | 721 |  |  | — |  |  | — |  |  | 79,219 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 162,448 |  |  | 1,465 |  |  | 6,394 |  |  | — |  |  | — |  |  | 170,307 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 187,519 |  |  | 3,459 |  |  | 2,464 |  |  | — |  |  | — |  |  | 193,442 |
Income property |  | 1,301,779 |  |  | 3,517 |  |  | 4,248 |  |  | — |  |  | — |  |  | 1,309,544 |
Owner occupied |  | 828,244 |  |  | 1,757 |  |  | 16,186 |  |  | — |  |  | — |  |  | 846,187 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 16,180 |  |  | 166 |  |  | 452 |  |  | — |  |  | — |  |  | 16,798 |
Residential construction |  | 103,257 |  |  | 680 |  |  | 1,708 |  |  | — |  |  | — |  |  | 105,645 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 62,958 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 62,958 |
Owner occupied |  | 54,563 |  |  | — |  |  | 876 |  |  | — |  |  | — |  |  | 55,439 |
Consumer |  | 331,413 |  |  | — |  |  | 4,745 |  |  | — |  |  | — |  |  | 336,158 |
Total |  | $ | 5,122,539 |  |  | $ | 30,254 |  |  | $ | 78,263 |  |  | $ | — |  |  | $ | — |  |  | 5,231,056 |
Less: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses |  | 53,703 |
Loans, excluding PCI loans, net |  | $ | 5,177,353 |

|  | Pass |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
December 31, 2014 |  | (in thousands)
Loans, excluding PCI loans: |  |  |  |  |  |  |  |  |  |  |  |
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 1,963,210 |  |  | $ | 15,790 |  |  | $ | 54,628 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,033,628 |
Unsecured |  | 79,534 |  |  | — |  |  | 559 |  |  | — |  |  | — |  |  | 80,093 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 163,914 |  |  | 55 |  |  | 7,795 |  |  | — |  |  | — |  |  | 171,764 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 183,701 |  |  | 4,217 |  |  | 1,861 |  |  | — |  |  | — |  |  | 189,779 |
Income property |  | 1,287,729 |  |  | 5,885 |  |  | 8,385 |  |  | — |  |  | — |  |  | 1,301,999 |
Owner occupied |  | 825,694 |  |  | 7,876 |  |  | 11,171 |  |  | — |  |  | — |  |  | 844,741 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 15,307 |  |  | 167 |  |  | 1,036 |  |  | — |  |  | — |  |  | 16,510 |
Residential construction |  | 96,031 |  |  | 909 |  |  | 1,581 |  |  | — |  |  | — |  |  | 98,521 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 73,783 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 73,783 |
Owner occupied |  | 58,055 |  |  | — |  |  | 889 |  |  | — |  |  | — |  |  | 58,944 |
Consumer |  | 339,695 |  |  | 68 |  |  | 5,269 |  |  | — |  |  | — |  |  | 345,032 |
Total |  | $ | 5,086,653 |  |  | $ | 34,967 |  |  | $ | 93,174 |  |  | $ | — |  |  | $ | — |  |  | 5,214,794 |
Less: |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses |  | 53,233 |
Loans, excluding PCI loans, net |  | $ | 5,161,561 |

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The following is an analysis of the credit quality of our PCI loan portfolio as of March 31, 2015 and December 31, 2014:

|  | Pass |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
March 31, 2015 |  | (in thousands)
PCI loans: |  |  |  |  |  |  |  |  |  |  |  |
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 39,919 |  |  | $ | 1,040 |  |  | $ | 9,060 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,019 |
Unsecured |  | 2,057 |  |  | — |  |  | 39 |  |  | — |  |  | — |  |  | 2,096 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 27,881 |  |  | — |  |  | 3,246 |  |  | — |  |  | — |  |  | 31,127 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 8,739 |  |  | — |  |  | 1,668 |  |  | — |  |  | — |  |  | 10,407 |
Income property |  | 45,298 |  |  | — |  |  | 12,031 |  |  | — |  |  | — |  |  | 57,329 |
Owner occupied |  | 56,004 |  |  | 336 |  |  | 3,876 |  |  | — |  |  | — |  |  | 60,216 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 1,452 |  |  | — |  |  | 894 |  |  | — |  |  | — |  |  | 2,346 |
Residential construction |  | 732 |  |  | — |  |  | 948 |  |  | — |  |  | — |  |  | 1,680 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 1,359 |  |  | — |  |  | 224 |  |  | — |  |  | — |  |  | 1,583 |
Owner occupied |  | 918 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 918 |
Consumer |  | 23,431 |  |  | — |  |  | 1,959 |  |  | — |  |  | — |  |  | 25,390 |
Total |  | $ | 207,790 |  |  | $ | 1,376 |  |  | $ | 33,945 |  |  | $ | — |  |  | $ | — |  |  | 243,111 |
Less: |  |  |  |  |  |  |  |  |  |  |  |
Valuation discount resulting from acquisition accounting |  | 23,272 |
Allowance for loan losses |  | 16,531 |
PCI loans, net |  | $ | 203,308 |

|  | Pass |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
December 31, 2014 |  | (in thousands)
PCI loans: |  |  |  |  |  |  |  |  |  |  |  |
Commercial business: |  |  |  |  |  |  |  |  |  |  |  |
Secured |  | $ | 37,927 |  |  | $ | 937 |  |  | $ | 9,223 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,087 |
Unsecured |  | 2,156 |  |  | — |  |  | 91 |  |  | — |  |  | — |  |  | 2,247 |
Real estate: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential |  | 28,822 |  |  | — |  |  | 3,159 |  |  | — |  |  | — |  |  | 31,981 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Commercial land |  | 9,104 |  |  | — |  |  | 6,240 |  |  | — |  |  | — |  |  | 15,344 |
Income property |  | 51,435 |  |  | 1,892 |  |  | 7,186 |  |  | — |  |  | — |  |  | 60,513 |
Owner occupied |  | 58,629 |  |  | 346 |  |  | 5,566 |  |  | — |  |  | — |  |  | 64,541 |
Real estate construction: |  |  |  |  |  |  |  |  |  |  |  |
One-to-four family residential: |  |  |  |  |  |  |  |  |  |  |  |
Land and acquisition |  | 1,595 |  |  | — |  |  | 913 |  |  | — |  |  | — |  |  | 2,508 |
Residential construction |  | 741 |  |  | — |  |  | 1,104 |  |  | — |  |  | — |  |  | 1,845 |
Commercial and multifamily residential: |  |  |  |  |  |  |  |  |  |  |  |
Income property |  | 1,435 |  |  | — |  |  | 227 |  |  | — |  |  | — |  |  | 1,662 |
Owner occupied |  | 926 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 926 |
Consumer |  | 24,037 |  |  | — |  |  | 2,777 |  |  | — |  |  | — |  |  | 26,814 |
Total |  | $ | 216,807 |  |  | $ | 3,175 |  |  | $ | 36,486 |  |  | $ | — |  |  | $ | — |  |  | 256,468 |
Less: |  |  |  |  |  |  |  |  |  |  |  |
Valuation discount resulting from acquisition accounting |  | 25,884 |
Allowance for loan losses |  | 16,336 |
PCI loans, net |  | $ | 214,248 |

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7. | Other Real Estate Owned (“OREO”)

The following tables set forth activity in OREO for the three months ended March 31, 2015 and 2014:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance, beginning of period |  | $ | 22,190 |  |  | $ | 35,927 |
Transfers in |  | 4,692 |  |  | 5,751 |
Valuation adjustments |  | (197 | ) |  | (1,580 | )
Proceeds from sale of OREO property |  | (5,122 | ) |  | (11,205 | )
Gain on sale of OREO, net |  | 1,736 |  |  | 1,659 |
Balance, end of period |  | $ | 23,299 |  |  | $ | 30,552 |

At March 31, 2015, the carrying amount of foreclosed residential real estate properties held as a result of obtaining physical possession was $2.1 million and the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $2.7 million.
8. FDIC Loss-sharing Asset and Covered Assets
We are a party to eight loss-sharing agreements with the FDIC relating to four FDIC-assisted acquisitions. Such agreements cover a substantial portion of losses incurred on acquired covered loans and OREO. The loss-sharing agreements relate to the acquisitions of (1) Columbia River Bank in January 2010, (2) American Marine Bank in January 2010, (3) Summit Bank in May 2011, and (4) First Heritage Bank in May 2011. Under the terms of the loss-sharing agreements, the FDIC will absorb 80% of losses and share in 80% of loss recoveries up to specified amounts. With respect to loss-sharing agreements for two acquisitions completed in 2010, after those specified amounts, the FDIC will absorb 95% of losses and share in 95% of loss recoveries. The loss-sharing provisions of the agreements for commercial and single-family mortgage loans are in effect for five and ten years, respectively and the loss recovery provisions are in effect for eight and ten years, respectively. The loss-sharing provisions for the Columbia River Bank and American Marine Bank non-single family covered assets were effective through the end of the current quarter. Accordingly, further activity will be limited to recoveries through the first quarter of 2020 for assets covered by these loss-sharing agreements.
Ten years and forty-five days after the applicable acquisition dates, the Bank must pay to the FDIC a clawback in the event the losses from the acquisitions fail to reach stated levels. The amount of the clawback is determined by a formula specified in each individual loss-sharing agreement. As of March 31, 2015, the net present value of the Bank’s estimated clawback liability was $4.2 million, which was included in other liabilities on the consolidated balance sheets.
At March 31, 2015, the FDIC loss-sharing asset was comprised of a $10.6 million FDIC indemnification asset and a $4.0 million FDIC receivable. The indemnification asset represents the cash flows the Company expects to collect from the FDIC under the loss-sharing agreements and the FDIC receivable represents amounts from the FDIC for which the Company has requested reimbursement but has not yet received reimbursement.
For PCI loans, the Company remeasures contractual and expected cash flows on a quarterly basis. When the quarterly remeasurement process results in a decrease in expected cash flows due to an increase in expected credit losses, impairment is recorded. As a result of this impairment, for loans covered by loss-share agreements with respect to which the loss-sharing provisions are still effective, the indemnification asset is increased to reflect anticipated future cash to be received from the FDIC. Consistent with the loss-sharing agreements between the Company and the FDIC, the amount of the increase to the indemnification asset is measured as 80% of the resulting impairment.
Alternatively, when the quarterly remeasurement results in an increase in expected future cash flows due to a decrease in expected credit losses, the nonaccretable difference decreases and the effective yield of the related loan portfolio is increased. As a result of the improved expected cash flows, for loans covered by loss-share agreements with respect to which the loss-sharing provisions are still effective, the indemnification asset would be reduced first by the amount of any impairment previously recorded and, second, by increased amortization over the remaining life of the related loss-sharing agreement.
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The following table shows a detailed analysis of the FDIC loss-sharing asset for the three months ended March 31, 2015 and 2014:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance at beginning of period |  | $ | 15,174 |  |  | $ | 39,846 |
Adjustments not reflected in income: |  |  |  |
Cash payments to (from) the FDIC |  | (659 | ) |  | 1,678 |
FDIC reimbursable losses (recoveries), net |  | (21 | ) |  | 132 |
Adjustments reflected in income: |  |  |  |
Amortization, net |  | (2,294 | ) |  | (6,452 | )
Loan impairment |  | 1,532 |  |  | 1,938 |
Sale of other real estate |  | (420 | ) |  | (756 | )
Write-downs of other real estate |  | 1,071 |  |  | 516 |
Other |  | 261 |  |  | (65 | )
Balance at end of period |  | $ | 14,644 |  |  | $ | 36,837 |

The following table presents information about the composition of the FDIC loss-sharing asset, the clawback liability, and the non-single family and the single family covered assets as of the date indicated:

|  | March 31, 2015
|  | Columbia River Bank |  | American Marine Bank |  | Summit Bank |  | First Heritage Bank |  | Total
|  | (in thousands)
FDIC loss-sharing asset |  | $ | 2,124 |  |  | $ | 4,824 |  |  | $ | 4,162 |  |  | $ | 3,534 |  |  | $ | 14,644 |
Clawback liability |  | $ | 4,063 |  |  | $ | 136 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,199 |
Non-single family covered assets |  | $ | 107,135 |  |  | $ | 16,914 |  |  | $ | 13,856 |  |  | $ | 22,763 |  |  | $ | 160,668 |
Single family covered assets |  | $ | 9,994 |  |  | $ | 26,391 |  |  | $ | 6,322 |  |  | $ | 2,479 |  |  | $ | 45,186 |
Loss-sharing expiration dates: |  |  |  |  |  |  |  |  |  |
Non-single family |  | First Quarter 2015 |  | First Quarter 2015 |  | Second Quarter 2016 |  | Second Quarter 2016 |  |
Single family |  | First Quarter 2020 |  | First Quarter 2020 |  | Second Quarter 2021 |  | Second Quarter 2021 |  |
Loss recovery expiration dates: |  |  |  |  |  |  |  |  |  |
Non-single family |  | First Quarter 2018 |  | First Quarter 2018 |  | Second Quarter 2019 |  | Second Quarter 2019 |  |
Single family |  | First Quarter 2020 |  | First Quarter 2020 |  | Second Quarter 2021 |  | Second Quarter 2021 |  |

9. | Goodwill and Other Intangible Assets

In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value.
The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.
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The following table sets forth activity for goodwill and other intangible assets for the periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Goodwill |  |  |  |
Total goodwill (1) |  | $ | 382,537 |  |  | $ | 343,952 |
Other intangible assets, net |  |  |  |
Core deposit intangible: |  |  |  |
Gross core deposit intangible balance at beginning of period (1) |  | 58,598 |  |  | 47,698 |
Accumulated amortization at beginning of period |  | (29,058 | ) |  | (22,765 | )
Core deposit intangible, net at beginning of period |  | 29,540 |  |  | 24,933 |
CDI current period amortization |  | (1,817 | ) |  | (1,579 | )
Total core deposit intangible, net at end of period |  | 27,723 |  |  | 23,354 |
Intangible assets not subject to amortization |  | 919 |  |  | 919 |
Other intangible assets, net at end of period |  | 28,642 |  |  | 24,273 |
Total goodwill and other intangible assets at end of period |  | $ | 411,179 |  |  | $ | 368,225 |

__________
(1) See Note 3, Business Combinations, for additional information regarding goodwill and intangible assets recorded related to the acquisition of Intermountain on November 1, 2014.
The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2015 and the succeeding four years:

|  | Amount
|  | (in thousands)
Year ending December 31, |  |
2015 |  | $ | 5,065 |
2016 |  | 5,945 |
2017 |  | 4,913 |
2018 |  | 3,855 |
2019 |  | 2,951 |

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10. | Derivatives and Balance Sheet Offsetting

The Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third-party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at March 31, 2015 and December 31, 2014 was $222.9 million and $215.6 million, respectively. During the current quarter, a mark-to-market loss of $5 thousand was recorded to other noninterest expense. There was no earnings impact for the three month period ending March 31, 2014.
The following table presents the fair value of derivatives not designated as hedging instruments at March 31, 2015 and December 31, 2014:

| Asset Derivatives |  | Liability Derivatives
| March 31, 2015 |  | December 31, 2014 |  | March 31, 2015 |  | December 31, 2014
| Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
| (in thousands)
Interest rate contracts | Other assets |  | $ | 14,244 |  |  | Other assets |  | $ | 11,800 |  |  | Other liabilities |  | $ | 14,300 |  |  | Other liabilities |  | $ | 11,851 |

The Company is party to interest rate contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.

| Gross Amounts of Recognized Assets/Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets |  | Gross Amounts Not Offset in the Consolidated Balance Sheets
|  |  |  | Collateral Posted |  | Net Amount
March 31, 2015 | (in thousands)
Assets |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | 14,244 |  |  | $ | — |  |  | $ | 14,244 |  |  | $ | — |  |  | $ | 14,244 |
Liabilities |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | 14,300 |  |  | $ | — |  |  | $ | 14,300 |  |  | $ | (14,300 | ) |  | $ | — |
Repurchase agreements | $ | 96,852 |  |  | $ | — |  |  | $ | 96,852 |  |  | $ | (96,852 | ) |  | $ | — |
December 31, 2014 |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | 11,800 |  |  | $ | — |  |  | $ | 11,800 |  |  | $ | — |  |  | $ | 11,800 |
Liabilities |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | 11,851 |  |  | $ | — |  |  | $ | 11,851 |  |  | $ | (11,851 | ) |  | $ | — |
Repurchase agreements | $ | 105,080 |  |  | $ | — |  |  | $ | 105,080 |  |  | $ | (105,080 | ) |  | $ | — |

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11. | Shareholders’ Equity

Preferred Stock. In conjunction with the 2013 acquisition of West Coast, the Company issued 8,782 shares of mandatorily convertible cumulative participating preferred stock, Series B (“Series B Preferred Stock”). The Series B Preferred Stock is not subject to the operation of a sinking fund. The Series B Preferred Stock is not redeemable by the Company and is perpetual with no maturity. The holders of Series B Preferred Stock have no general voting rights. If the Company declares and pays a dividend to its common shareholders, it must declare and pay to its holders of Series B Preferred Stock, on the same date, a dividend in an amount per share of the Series B Preferred Stock that is intended to provide such holders dividends in the amount they would have received if shares of Series B Preferred Stock had been converted into common stock as of that date. The outstanding shares of Series B Preferred Stock are convertible into 102,363 shares of Company common stock.
Dividends. On January 29, 2015, the Company declared a quarterly cash dividend of $0.16 per common share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.14 per common share and common share equivalent for holders of preferred stock, both payable on February 25, 2015 to shareholders of record at the close of business on February 11, 2015.
Subsequent to quarter end, on April 22, 2015, the Company declared a regular quarterly cash dividend of $0.18 per common share and common share equivalent for holders of preferred stock, and a special cash dividend of $0.16 per common share and common share equivalent for holders of preferred stock, both payable on May 20, 2015 to shareholders of record at the close of business on May 6, 2015.
The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.
12. Accumulated Other Comprehensive Income (Loss)
The following table shows changes in accumulated other comprehensive income (loss) by component for the three month periods ended March 31, 2015 and 2014:

|  | Unrealized Gains and Losses on Available-for-Sale Securities (1) |  | Unrealized Gains and Losses on Pension Plan Liability (1) |  | Total (1)
Three months ended March 31, 2015 |  | (in thousands)
Beginning balance |  | $ | 7,462 |  |  | $ | (1,841 | ) |  | $ | 5,621 |
Other comprehensive income (loss) before reclassifications |  | 9,376 |  |  | (280 | ) |  | 9,096 |
Amounts reclassified from accumulated other comprehensive income (loss) (2) |  | (459 | ) |  | 28 |  |  | (431 | )
Net current-period other comprehensive income (loss) |  | 8,917 |  |  | (252 | ) |  | 8,665 |
Ending balance |  | $ | 16,379 |  |  | $ | (2,093 | ) |  | $ | 14,286 |
Three months ended March 31, 2014 |  |  |  |  |  |
Beginning balance |  | $ | (10,108 | ) |  | $ | (1,936 | ) |  | $ | (12,044 | )
Other comprehensive income before reclassifications |  | 7,119 |  |  | — |  |  | 7,119 |
Amounts reclassified from accumulated other comprehensive income (2) |  | (142 | ) |  | 24 |  |  | (118 | )
Net current-period other comprehensive income |  | 6,977 |  |  | 24 |  |  | 7,001 |
Ending balance |  | $ | (3,131 | ) |  | $ | (1,912 | ) |  | $ | (5,043 | )

__________
(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
(2) See following table for details about these reclassifications.
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The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the three month periods ended March 31, 2015 and 2014:

|  | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) |  |
|  | Three Months Ended March 31, |  | Affected line Item in the Consolidated
|  | 2015 |  | 2014 |  | Statement of Income
|  | (in thousands) |  |
Unrealized gains and losses on available-for-sale securities |  |  |  |  |  |
Investment securities gains |  | $ | 721 |  |  | $ | 223 |  |  | Investment securities gains, net
|  | 721 |  |  | 223 |  |  | Total before tax
|  | (262 | ) |  | (81 | ) |  | Income tax provision
|  | $ | 459 |  |  | $ | 142 |  |  | Net of tax
Amortization of pension plan liability |  |  |  |  |  |
Actuarial losses |  | $ | (44 | ) |  | $ | (37 | ) |  | Compensation and employee benefits
|  | (44 | ) |  | (37 | ) |  | Total before tax
|  | 16 |  |  | 13 |  |  | Income tax benefit
|  | $ | (28 | ) |  | $ | (24 | ) |  | Net of tax

13. | Fair Value Accounting and Measurement

The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available.
The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy:
Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date.
Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable.
Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable.
Fair values are determined as follows:
Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury notes, which are considered a Level 1 input method.
Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy.
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The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2015 and December 31, 2014 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

|  | Fair value |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
March 31, 2015 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,102,700 |  |  | $ | — |  |  | $ | 1,102,700 |  |  | $ | — |
State and municipal debt securities |  | 501,671 |  |  | — |  |  | 501,671 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 376,798 |  |  | — |  |  | 376,798 |  |  | — |
U.S. government securities |  | 20,778 |  |  | 20,778 |  |  | — |  |  | — |
Other securities |  | 5,212 |  |  | — |  |  | 5,212 |  |  | — |
Total securities available for sale |  | $ | 2,007,159 |  |  | $ | 20,778 |  |  | $ | 1,986,381 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 14,244 |  |  | $ | — |  |  | $ | 14,244 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 14,300 |  |  | $ | — |  |  | $ | 14,300 |  |  | $ | — |

|  | Fair value |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
December 31, 2014 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,162,387 |  |  | $ | — |  |  | $ | 1,162,387 |  |  | $ | — |
State and municipal debt securities |  | 496,484 |  |  | — |  |  | 496,484 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 413,706 |  |  | — |  |  | 413,706 |  |  | — |
U.S. government securities |  | 20,499 |  |  | 20,499 |  |  | — |  |  | — |
Other securities |  | 5,181 |  |  | — |  |  | 5,181 |  |  | — |
Total securities available for sale |  | $ | 2,098,257 |  |  | $ | 20,499 |  |  | $ | 2,077,758 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 11,800 |  |  | $ | — |  |  | $ | 11,800 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 11,851 |  |  | $ | — |  |  | $ | 11,851 |  |  | $ | — |

There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the three month periods ended March 31, 2015 and 2014. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.
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Nonrecurring Measurements
Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:
Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the ALLL process on a quarterly basis by officers in the Special Credits group, which reports to the Chief Credit Officer. The Real Estate Appraisal Services Department (“REASD”), which also reports to the Chief Credit Officer, is responsible for obtaining appraisals from third-parties or performing internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
Other real estate owned—OREO is real property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO is generally measured based on the property’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO is initially recorded at the fair value less estimated costs to sell. This amount becomes the property’s new basis. Any fair value adjustments based on the property’s fair value less estimated costs to sell at the date of acquisition are charged to the ALLL, or in the event of a write-up without previous losses charged to the ALLL, a credit to earnings is recorded. Management periodically reviews OREO in an effort to ensure the property is recorded at its fair value, net of estimated costs to sell. Any fair value adjustments subsequent to acquisition are charged or credited to earnings. The initial and subsequent evaluations are performed by officers in the Special Credits group, which reports to the Chief Credit Officer. The REASD obtains appraisals from third-parties for OREO and performs internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:

|  | Fair value at March 31, 2015 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended March 31, 2015
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
OREO |  | $ | 1,429 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,429 |  |  | $ | 197 |
|  | $ | 1,429 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,429 |  |  | $ | 197 |

|  | Fair value at March 31, 2014 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended March 31, 2014
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 2,094 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,094 |  |  | $ | 1,387 |
OREO (1) |  | 6,125 |  |  | — |  |  | — |  |  | 6,125 |  |  | 1,303 |
|  | $ | 8,219 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,219 |  |  | $ | 2,690 |

__________
(1) Reclassified to conform to the current period’s presentation. The reclassification was limited to combining historically reported “Noncovered OREO” and “Covered OREO” into one line item for OREO.
The losses on impaired loans disclosed above represent the amount of the specific reserve and/or charge-offs during the period applicable to loans held at period end. The amount of the specific reserve is included in the allowance for loan and lease losses. The losses on OREO disclosed above represent the write-downs taken at foreclosure that were charged to the allowance for loan and lease losses, as well as subsequent changes in any valuation allowances from updated appraisals that were recorded to earnings.
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Quantitative information about Level 3 fair value measurements
The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table:

|  | Fair value at March 31, 2015 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
OREO |  | $ | 1,429 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal value during the current period.

|  | Fair value at March 31, 2014 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans |  | $ | 990 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
Impaired loans - other collateral (3) |  | 1,104 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated value |  | 0% - 100% (68%)
OREO |  | 6,125 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate and OREO because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of accounts receivable, inventory and equipment.

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Fair value of financial instruments
Because broadly traded markets do not exist for most of the Company’s financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. These determinations are subjective in nature, involve uncertainties and matters of significant judgment and do not include tax ramifications; therefore, the results cannot be determined with precision, substantiated by comparison to independent markets and may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein do not represent, and should not be construed to represent, the underlying value of the Company.
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash and due from banks and interest-earning deposits with banks—The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value that approximates carrying value (Level 1).
Securities available for sale—Securities at fair value, other than U.S. Treasury Notes, are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors (Level 2). U.S. Treasury Notes are priced using quotes in active markets (Level 1).
Federal Home Loan Bank stock—The fair value is based upon the par value of the stock which equates to its carrying value (Level 2).
Loans—Loans are not recorded at fair value on a recurring basis. Nonrecurring fair value adjustments are periodically recorded on impaired loans that are measured for impairment based on the fair value of collateral. For most performing loans, fair value is estimated using expected duration and lending rates that would have been offered on March 31, 2015 or December 31, 2014, for loans which mirror the attributes of the loans with similar rate structures and average maturities. The fair values resulting from these calculations are reduced by an amount representing the change in estimated fair value attributable to changes in borrowers’ credit quality since the loans were originated. For nonperforming loans, fair value is estimated by applying a valuation discount based upon loan sales data from the FDIC. For PCI loans, fair value is estimated by discounting the expected future cash flows using a lending rate that would have been offered on March 31, 2015 (Level 3).
FDIC loss-sharing asset —The fair value of the FDIC loss-sharing asset is estimated based on discounting the expected future cash flows using an estimated market rate (Level 3).
Interest rate contracts—Interest rate swap positions are valued in models, which use readily observable market parameters as their basis (Level 2).
Deposits—For deposits with no contractual maturity, the fair value is equal to the carrying value (Level 1). The fair value of fixed maturity deposits is based on discounted cash flows using the difference between the deposit rate and current market rates for deposits of similar remaining maturities (Level 2).
FHLB advances—The fair value of FHLB advances is estimated based on discounting the future cash flows using the market rate currently offered (Level 2).
Repurchase Agreements—The fair value of term repurchase agreements is estimated based on discounting the future cash flows using the market rate currently offered. The carrying amount of sweep repurchase agreements approximates their fair values due to the short period of time between repricing dates (Level 2).
Other Borrowings— Other borrowings are trust preferred obligations assumed by the Company in the Intermountain acquisition. The fair value is estimated as the carrying value as these obligations are redeemable and a market participant would expect redemption in the near-term (Level 2).
Other Financial Instruments—The majority of our commitments to extend credit and standby letters of credit carry current market interest rates if converted to loans, as such, carrying value is assumed to equal fair value.
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The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at March 31, 2015 and December 31, 2014:

|  | March 31, 2015
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 177,026 |  |  | $ | 177,026 |  |  | $ | 177,026 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 71,575 |  |  | 71,575 |  |  | 71,575 |  |  | — |  |  | — |
Securities available for sale |  | 2,007,159 |  |  | 2,007,159 |  |  | 20,778 |  |  | 1,986,381 |  |  | — |
FHLB stock |  | 33,004 |  |  | 33,004 |  |  | — |  |  | 33,004 |  |  | — |
Loans held for sale |  | 3,545 |  |  | 3,545 |  |  | — |  |  | 3,545 |  |  | — |
Loans |  | 5,380,661 |  |  | 5,540,202 |  |  | — |  |  | — |  |  | 5,540,202 |
FDIC loss-sharing asset |  | 14,644 |  |  | 4,918 |  |  | — |  |  | — |  |  | 4,918 |
Interest rate contracts |  | 14,244 |  |  | 14,244 |  |  | — |  |  | 14,244 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 7,074,965 |  |  | $ | 7,069,844 |  |  | $ | 6,577,549 |  |  | $ | 492,295 |  |  | $ | — |
FHLB Advances |  | 36,559 |  |  | 37,413 |  |  | — |  |  | 37,413 |  |  | — |
Repurchase agreements |  | 96,852 |  |  | 97,868 |  |  | — |  |  | 97,868 |  |  | — |
Interest rate contracts |  | 14,300 |  |  | 14,300 |  |  | — |  |  | 14,300 |  |  | — |

|  | December 31, 2014
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 171,221 |  |  | $ | 171,221 |  |  | $ | 171,221 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 16,949 |  |  | 16,949 |  |  | 16,949 |  |  | — |  |  | — |
Securities available for sale |  | 2,098,257 |  |  | 2,098,257 |  |  | 20,499 |  |  | 2,077,758 |  |  | — |
FHLB stock |  | 33,365 |  |  | 33,365 |  |  | — |  |  | 33,365 |  |  | — |
Loans held for sale |  | 1,116 |  |  | 1,116 |  |  | — |  |  | 1,116 |  |  | — |
Loans |  | 5,375,809 |  |  | 5,516,286 |  |  | — |  |  | — |  |  | 5,516,286 |
FDIC loss-sharing asset |  | 15,174 |  |  | 4,054 |  |  | — |  |  | — |  |  | 4,054 |
Interest rate contracts |  | 11,800 |  |  | 11,800 |  |  | — |  |  | 11,800 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 6,924,722 |  |  | $ | 6,921,804 |  |  | $ | 6,416,017 |  |  | $ | 505,787 |  |  | $ | — |
FHLB Advances |  | 216,568 |  |  | 217,296 |  |  | — |  |  | 217,296 |  |  | — |
Repurchase agreements |  | 105,080 |  |  | 106,171 |  |  | — |  |  | 106,171 |  |  | — |
Interest rate contracts |  | 11,851 |  |  | 11,851 |  |  | — |  |  | 11,851 |  |  | — |

14. | Earnings per Common Share

The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company issues restricted shares under share-based compensation plans and preferred shares which qualify as participating securities.
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The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2015 and 2014:

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands except per share)
Basic EPS: |  |  |  |
Net income |  | $ | 24,361 |  |  | $ | 19,844 |
Less: Earnings allocated to participating securities |  |  |  |
Preferred shares |  | 43 |  |  | 40 |
Nonvested restricted shares |  | 225 |  |  | 169 |
Earnings allocated to common shareholders |  | $ | 24,093 |  |  | $ | 19,635 |
Weighted average common shares outstanding |  | 56,965 |  |  | 51,097 |
Basic earnings per common share |  | $ | 0.42 |  |  | $ | 0.38 |
Diluted EPS: |  |  |  |
Earnings allocated to common shareholders (1) |  | $ | 24,093 |  |  | $ | 19,639 |
Weighted average common shares outstanding |  | 56,965 |  |  | 51,097 |
Dilutive effect of equity awards |  | 13 |  |  | 1,336 |
Weighted average diluted common shares outstanding |  | 56,978 |  |  | 52,433 |
Diluted earnings per common share |  | $ | 0.42 |  |  | $ | 0.37 |
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive |  | 53 |  |  | 83 |

__________

(1) | Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.

15. | Subsequent Event

Subsequent events are events or transactions that occur after the balance sheet date but before financial statements are issued. Recognized subsequent events are events or transactions that provide additional evidence about conditions that existed at the date of the balance sheet, including the estimates inherent in the process of preparing financial statements. Nonrecognized subsequent events are events that provide evidence about conditions that did not exist at the date of the balance sheet but arose after that date.
On April 23, 2015 the Company filed an amendment to its amended and restated articles of incorporation (following shareholder approval on April 22, 2015) providing for an increase in the number of authorized common shares from 63,032,681 to 115,000,000.
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Item 2. | MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This discussion should be read in conjunction with the unaudited consolidated financial statements of Columbia Banking System, Inc. (referred to in this report as “we”, “our”, “Columbia” and “the Company”) and notes thereto presented elsewhere in this report and with the December 31, 2014 audited consolidated financial statements and its accompanying notes included in our Annual Report on Form 10-K. In the following discussion, unless otherwise noted, references to increases or decreases in average balances in items of income and expense for a particular period and balances at a particular date refer to the comparison with corresponding amounts for the period or date one year earlier.
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS
This quarterly report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, but are not limited to, statements about our plans, objectives, expectations and intentions that are not historical facts, and statements identified by words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “should,” “projects,” “seeks,” “estimates” or the negative version of those words or other comparable words or phrases of a future or forward-looking nature. These forward-looking statements are based on current beliefs and expectations of management and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. In addition to the factors set forth in the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this report and the factors set forth in the section titled “Risk Factors” in the Company’s Form 10-K, the following factors, among others, could cause actual results to differ materially from the anticipated results expressed or implied by the forward-looking statements:

• | local and national economic conditions could be less favorable than expected or could have a more direct and pronounced effect on us than expected and adversely affect our ability to continue internal growth and maintain the quality of our earning assets;

• | the local housing/real estate markets where we operate and make loans could face challenges;

• | the risks presented by the economy, which could adversely affect credit quality, collateral values, including real estate collateral, investment values, liquidity and loan originations and loan portfolio delinquency rates;

• | the efficiencies and enhanced financial and operating performance we expect to realize from investments in personnel, acquisitions and infrastructure may not be realized;

• | the ability to complete future acquisitions and to successfully integrate acquired entities (including Intermountain Community Bancorp (“Intermountain”) into Columbia;

• | interest rate changes could significantly reduce net interest income and negatively affect funding sources;

• | projected business increases following strategic expansion or opening of new branches could be lower than expected;

• | changes in the scope and cost of Federal Deposit Insurance Corporation (“FDIC”) insurance and other coverages;

• | the impact of acquired loans on our earnings;

• | changes in accounting principles, policies, and guidelines applicable to bank holding companies and banking;

• | changes in laws and regulations affecting our businesses, including changes in the enforcement and interpretation of such laws and regulations by applicable governmental and regulatory agencies;

• | competition among financial institutions could increase significantly;

• | continued consolidation in the Pacific Northwest financial services industry resulting in the creation of larger financial institutions that may have greater resources could change the competitive landscape;

• | the goodwill we have recorded in connection with acquisitions could become impaired, which may have an adverse impact on our earnings and capital;

• | the reputation of the financial services industry could deteriorate, which could adversely affect our ability to access markets for funding and to acquire and retain customers;

• | our ability to identify and address cyber-security risks, including security breaches, “denial of service attacks,” “hacking” and identity theft;

• | any material failure or interruption of our information and communications systems or inability to keep pace with technological changes;

• | our ability to effectively manage credit risk, interest rate risk, market risk, operational risk, legal risk, liquidity risk and regulatory and compliance risk;

• | the effect of geopolitical instability, including wars, conflicts and terrorist attacks;

• | our profitability measures could be adversely affected if we are unable to effectively manage our capital; and

• | the effects of any damage to our reputation resulting from developments related to any of the items identified above.

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You should take into account that forward-looking statements speak only as of the date of this report. Given the described uncertainties and risks, we cannot guarantee our future performance or results of operations and you should not place undue reliance on these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required under federal securities laws.
CRITICAL ACCOUNTING POLICIES
Management has identified the accounting policies related to the ALLL, business combinations, PCI loans, FDIC loss-sharing asset and the valuation and recoverability of goodwill as critical to an understanding of our financial statements. These policies and related estimates are discussed in “Item 7. Management Discussion and Analysis of Financial Condition and Results of Operation” under the headings “Allowance for Loan and Lease Losses”, “Business Combinations”, “Purchased Credit Impaired Loans”, “FDIC Loss-Sharing Asset” and “Valuation and Recoverability of Goodwill” in our 2014 Annual Report on Form 10-K. There have not been any material changes in our critical accounting policies as compared to those disclosed in our 2014 Annual Report on Form 10-K.
RESULTS OF OPERATIONS
Our results of operations are dependent to a large degree on our net interest income. We also generate noninterest income through service charges and fees, merchant services fees, and bank owned life insurance. Our operating expenses consist primarily of compensation and employee benefits, occupancy, merchant card processing, data processing and legal and professional fees. Like most financial institutions, our interest income and cost of funds are affected significantly by general economic conditions, particularly changes in market interest rates, and by government policies and actions of regulatory authorities.
On November 1, 2014, the Company completed its acquisition of Intermountain. The Company acquired approximately $964.4 million in assets, including $502.6 million in loans measured at fair value, and approximately $736.8 million in deposits. Due to the timing of this acquisition, our results of operations for the three month period ended March 31, 2015 include the acquisition for the entire period, however the prior year period does not include the acquisition. See Note 3 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report for further information regarding this acquisition.
Earnings Summary
The Company reported net income for the first quarter of $24.4 million or $0.42 per diluted common share, compared to $19.8 million or $0.37 per diluted common share for the first quarter of 2014. The increase in net income for the current quarter compared to the prior year period was due to a combination of higher net interest income and noninterest income, partially offset by higher noninterest expense. These fluctuations were primarily due to the timing of the acquisition of Intermountain, as noted above.
Comparison of current quarter to prior year period
Revenue (net interest income plus noninterest income) for the three months ended March 31, 2015 was $103.1 million, 17% more than the same period in 2014. The increase in revenue was a result of higher net interest income due in part to both the acquired loans and securities from the acquisition of Intermountain as well as higher noninterest income due to a decrease in the expense recorded for the change in the FDIC loss-sharing asset. For a more complete discussion of these topics, please refer to the net interest income and noninterest income sections contained in the ensuing pages.
The provision for loan and lease losses for the first quarter of 2015 was $1.2 million compared to a provision of $1.9 million during the first quarter of 2014. The provision recorded in the first quarter of 2015 was primarily due to the $2.6 million provision recorded for the PCI loan portfolio, partially offset by a provision recapture of $1.4 million related to loans, excluding PCI loans. For a more complete discussion of this topic, please refer to the provision for loan and lease losses section contained in the ensuing pages.
Total noninterest expense for the quarter ended March 31, 2015 was $66.7 million, up from $57.4 million for the first quarter of 2014. The increase from the prior-year period was primarily due to additional ongoing noninterest expense stemming from the growth resulting from the Intermountain acquisition as well as higher acquisition-related expenses recorded during the first quarter of 2015. For a more complete discussion of this topic, please refer to the noninterest expense section contained in the ensuing pages.
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Net income was positively affected by the pre-tax earnings impact of the FDIC acquired loan portfolios for the current period, but was negatively affected by the pre-tax earnings impact of the FDIC acquired loan portfolios during the prior year period. The negative effect of the FDIC acquired loan portfolios in the prior year period was primarily due to greater amortization of the FDIC loss-sharing asset recorded in the prior year period. With the recent expiration of our two largest FDIC loss-sharing agreements, the amortization of the FDIC loss-sharing asset has declined. The following table illustrates the impact to earnings associated with the Company’s FDIC acquired loan portfolios for the periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | ( in thousands)
Incremental accretion income on FDIC purchased credit impaired loans |  | $ | 2,447 |  |  | $ | 6,489 |
Incremental accretion income on other FDIC acquired loans |  | 117 |  |  | 204 |
Recapture (provision) for losses on purchased credit impaired loans |  | (2,609 | ) |  | (2,422 | )
Change in FDIC loss-sharing asset (1) |  | 150 |  |  | (4,819 | )
FDIC clawback liability recovery (expense) |  | (23 | ) |  | (204 | )
Pre-tax earnings impact of FDIC acquired loan portfolios |  | $ | 82 |  |  | $ | (752 | )

__________
(1) For additional information on the FDIC loss-sharing asset, please see the “FDIC Loss-sharing Asset” section of this Management’s Discussion and Analysis and Note 8 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.
Net Interest Income
Net interest income for the first quarter of 2015 was $80.4 million, an increase of 9% from $73.9 million for the same quarter in 2014. The increase in net interest income was due, in part, to the acquired loans and securities from the Intermountain transaction as well as organic growth in the loan portfolio, partially offset by lower incremental accretion income on acquired loans. For additional information on the Company’s accounting policies related to recording interest income on loans, please refer to “Item 8. Financial Statements and Supplementary Data” in our 2014 Annual Report on Form 10-K.
The Company’s net interest margin (tax equivalent) decreased to 4.39% in the first quarter of 2015, from 4.85% for the same quarter last year. This decrease was due to lower incremental accretion income on acquired loan portfolios. The Company’s operating net interest margin (tax equivalent) (1) decreased slightly to 4.18% from 4.19% due to lower rates on securities.
The following table shows the impact to interest income of incremental accretion income as well as the net interest margin and operating net interest margin for the periods presented:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (dollars in thousands)
Incremental accretion income due to: |  |  |  |
FDIC purchased credit impaired loans |  | $ | 2,447 |  |  | $ | 6,489 |
Other FDIC acquired loans |  | 117 |  |  | 204 |
Other acquired loans |  | 4,934 |  |  | 5,615 |
Incremental accretion income |  | $ | 7,498 |  |  | $ | 12,308 |
Net interest margin (tax equivalent) |  | 4.39 | % |  | 4.85 | %
Operating net interest margin (tax equivalent) (1) |  | 4.18 | % |  | 4.19 | %

__________
(1) Operating net interest margin (tax equivalent) is a non-GAAP measurement. See Non-GAAP measures section of Item 2, Management’s Discussion and Analysis.
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The following tables set forth the average balances of all major categories of interest-earning assets and interest-bearing liabilities, the total dollar amounts of interest income on interest-earning assets and interest expense on interest-bearing liabilities, the average yield earned on interest-earning assets and average rate paid on interest-bearing liabilities by category and, in total, net interest income and net interest margin:

|  | Three Months Ended March 31, |  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | Average Balances |  | Interest Earned / Paid |  | Average Rate |  | Average Balances |  | Interest Earned / Paid |  | Average Rate
|  | (dollars in thousands)
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Loans, net (1)(2)(3) |  | $ | 5,414,942 |  |  | $ | 71,487 |  |  | 5.28 | % |  | $ | 4,537,107 |  |  | $ | 65,898 |  |  | 5.81 | %
Taxable securities |  | 1,609,323 |  |  | 7,526 |  |  | 1.87 | % |  | 1,329,679 |  |  | 6,752 |  |  | 2.03 | %
Tax exempt securities (3) |  | 459,483 |  |  | 4,680 |  |  | 4.07 | % |  | 352,691 |  |  | 4,109 |  |  | 4.66 | %
Interest-earning deposits with banks |  | 45,292 |  |  | 27 |  |  | 0.24 | % |  | 25,215 |  |  | 14 |  |  | 0.23 | %
Total interest-earning assets |  | 7,529,040 |  |  | $ | 83,720 |  |  | 4.45 | % |  | 6,244,692 |  |  | $ | 76,773 |  |  | 4.92 | %
Other earning assets |  | 146,055 |  |  |  |  |  |  | 126,924 |  |  |  |  |
Noninterest-earning assets |  | 830,681 |  |  |  |  |  |  | 772,143 |  |  |  |  |
Total assets |  | $ | 8,505,776 |  |  |  |  |  |  | $ | 7,143,759 |  |  |  |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY
Certificates of deposit |  | $ | 502,287 |  |  | $ | 240 |  |  | 0.19 | % |  | $ | 503,129 |  |  | $ | 362 |  |  | 0.29 | %
Savings accounts |  | 625,132 |  |  | 19 |  |  | 0.01 | % |  | 513,911 |  |  | 13 |  |  | 0.01 | %
Interest-bearing demand |  | 1,214,149 |  |  | 138 |  |  | 0.05 | % |  | 1,168,708 |  |  | 109 |  |  | 0.04 | %
Money market accounts |  | 1,815,923 |  |  | 351 |  |  | 0.08 | % |  | 1,586,622 |  |  | 268 |  |  | 0.07 | %
Total interest-bearing deposits |  | 4,157,491 |  |  | 748 |  |  | 0.07 | % |  | 3,772,370 |  |  | 752 |  |  | 0.08 | %
Federal Home Loan Bank advances |  | 129,841 |  |  | 159 |  |  | 0.49 | % |  | 70,690 |  |  | 114 |  |  | 0.65 | %
Other borrowings |  | 108,170 |  |  | 146 |  |  | 0.54 | % |  | 25,000 |  |  | 119 |  |  | 1.90 | %
Total interest-bearing liabilities |  | 4,395,502 |  |  | $ | 1,053 |  |  | 0.10 | % |  | 3,868,060 |  |  | $ | 985 |  |  | 0.10 | %
Noninterest-bearing deposits |  | 2,770,265 |  |  |  |  |  |  | 2,129,468 |  |  |  |  |
Other noninterest-bearing liabilities |  | 99,156 |  |  |  |  |  |  | 78,878 |  |  |  |  |
Shareholders’ equity |  | 1,240,853 |  |  |  |  |  |  | 1,067,353 |  |  |  |  |
Total liabilities & shareholders’ equity |  | $ | 8,505,776 |  |  |  |  |  |  | $ | 7,143,759 |  |  |  |  |
Net interest income (tax equivalent) |  | $ | 82,667 |  |  |  |  |  |  | $ | 75,788 |  |  |
Net interest margin (tax equivalent) |  | 4.39 | % |  |  |  |  |  | 4.85 | %

__________

(1) | Adjusted to conform to the current period presentation. The adjustment was limited to including amounts historically disclosed as “Covered loans” in “Loans, net”.

(2) | Nonaccrual loans have been included in the tables as loans carrying a zero yield. Amortized net deferred loan fees and net unearned discounts on certain acquired loans were included in the interest income calculations. The amortization of net deferred loan fees was $1.1 million and $983 thousand for the three months ended March 31, 2015 and 2014, respectively. The incremental accretion income on acquired loans was $7.5 million and $12.3 million for the three months ended March 31, 2015 and 2014, respectively.

(3) | Tax-exempt income is calculated on a tax equivalent basis. The tax equivalent yield adjustment to interest earned on loans was $665 thousand and $357 thousand for the three months ended March 31, 2015 and 2014, respectively. The tax equivalent yield adjustment to interest earned on tax exempt securities was $1.6 million and $1.5 million for the three months ended March 31, 2015 and 2014, respectively.

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The following table sets forth the total dollar amount of change in interest income and interest expense. The changes have been segregated for each major category of interest-earning assets and interest-bearing liabilities into amounts attributable to changes in volume and changes in rates. Changes attributable to the combined effect of volume and interest rates have been allocated proportionately to the changes due to volume and the changes due to interest rates:

|  | Three Months Ended March 31, 2015 Compared to 2014 Increase (Decrease) Due to
|  | Volume |  | Rate |  | Total
|  | (in thousands)
Interest Income |  |  |  |  |  |
Loans, net |  | $ | 11,961 |  |  | $ | (6,372 | ) |  | $ | 5,589 |
Taxable securities |  | 1,338 |  |  | (564 | ) |  | 774 |
Tax exempt securities |  | 1,134 |  |  | (563 | ) |  | 571 |
Interest earning deposits with banks |  | 12 |  |  | 1 |  |  | 13 |
Interest income |  | $ | 14,445 |  |  | $ | (7,498 | ) |  | $ | 6,947 |
Interest Expense |  |  |  |  |  |
Deposits: |  |  |  |  |  |
Certificates of deposit |  | $ | (1 | ) |  | $ | (121 | ) |  | $ | (122 | )
Savings accounts |  | 3 |  |  | 3 |  |  | 6 |
Interest-bearing demand |  | 4 |  |  | 25 |  |  | 29 |
Money market accounts |  | 42 |  |  | 41 |  |  | 83 |
Total interest on deposits |  | 48 |  |  | (52 | ) |  | (4 | )
Federal Home Loan Bank advances |  | 78 |  |  | (33 | ) |  | 45 |
Other borrowings |  | 35 |  |  | (8 | ) |  | 27 |
Interest expense |  | $ | 161 |  |  | $ | (93 | ) |  | $ | 68 |

Provision for Loan and Lease Losses
During the first quarter of 2015, the Company recorded a $1.2 million provision expense compared with a provision expense of $1.9 million during the first quarter of 2014. The $1.2 million net provision for loan and lease losses recorded during the current quarter was primarily driven by the PCI loan portfolio, for which Columbia recorded a provision of $2.6 million, which was partially offset by a provision recapture of $1.4 million related to loans, excluding PCI loans. The provision recorded relating to PCI loans was due to the decrease in the present value of expected future cash flows as remeasured during the current quarter, compared to the present value of expected future cash flows during the fourth quarter of 2014. The $2.6 million provision related to PCI loans was partially offset by a $1.5 million favorable adjustment to the change in FDIC loss-sharing asset. The provision recapture of $1.4 million related to loans, excluding PCI loans was due to recovery activity during the current quarter and improvement in credit quality. The amount of provision recapture related to loans, excluding PCI loans, was calculated in accordance with the Company’s methodology for determining the ALLL, discussed in Note 6 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.
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Noninterest Income
The following table presents the significant components of noninterest income and the related dollar and percentage change from period to period:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014 |  | $ Change |  | % Change
|  | (dollars in thousands)
Service charges and other fees |  | $ | 14,869 |  |  | $ | 12,936 |  |  | $ | 1,933 |  |  | 15 | %
Merchant services fees |  | 2,040 |  |  | 1,870 |  |  | 170 |  |  | 9 | %
Bank owned life insurance |  | 1,078 |  |  | 965 |  |  | 113 |  |  | 12 | %
Other |  | 3,909 |  |  | 2,833 |  |  | 1,076 |  |  | 38 | %
Subtotal |  | 21,896 |  |  | 18,604 |  |  | 3,292 |  |  | 18 | %
Investment securities gains, net |  | 721 |  |  | 223 |  |  | 498 |  |  | 223 | %
Change in FDIC loss-sharing asset |  | 150 |  |  | (4,819 | ) |  | 4,969 |  |  | (103 | )%
Total noninterest income |  | $ | 22,767 |  |  | $ | 14,008 |  |  | $ | 8,759 |  |  | 63 | %

Noninterest income was $22.8 million for the first quarter of 2015, compared to $14.0 million for the same period in 2014. The increase was primarily due to the change in FDIC loss-sharing asset, which was a benefit of $150 thousand in the current quarter, but was an expense of $4.8 million for the same period in the prior year. Also contributing to the increase compared to the first quarter of 2014 was an increase in service charges and other fees of $1.9 million resulting from the increased customer base from the acquisition of Intermountain and an increase in other noninterest income primarily due to gains on sales of loans recorded in the current quarter of $923 thousand compared to $492 thousand in the prior year period.
The change in FDIC loss-sharing asset has been a significant component of noninterest income. Changes in the asset are primarily driven by amortization of the asset, the provision recorded for reimbursable losses on covered loans and write-downs of covered other real estate owned (“OREO”). For the first quarter of 2015, there was $2.3 million of amortization of the asset, which was more than offset by increases in the asset of $1.5 million related to the provision recorded for reimbursable losses on covered loans and $1.1 million related to write-downs of OREO. The decline in amortization recorded in the current quarter was due to the recent expiration of our two most significant FDIC loss-sharing agreements. For the same period in 2014, there was $6.5 million of amortization of the asset, which was partially offset by increases in the asset of $1.9 million related to the provision recorded for reimbursable losses on covered loans and $516 thousand related to write-downs of OREO. For additional information on the FDIC loss-sharing asset, please see the “FDIC Loss-sharing Asset” section of this Management’s Discussion and Analysis and Note 8 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.
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Noninterest Expense
The following table presents the significant components of noninterest expense and the related dollar and percentage change from period to period:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014 (1) |  | $ Change |  | % Change
|  | (dollars in thousands)
Compensation and employee benefits |  | $ | 39,100 |  |  | $ | 31,338 |  |  | $ | 7,762 |  |  | 25 | %
All other noninterest expense: |  |  |  |  |  |  |  |
Occupancy |  | 7,993 |  |  | 8,244 |  |  | (251 | ) |  | (3 | )%
Merchant processing |  | 977 |  |  | 980 |  |  | (3 | ) |  | — | %
Advertising and promotion |  | 931 |  |  | 769 |  |  | 162 |  |  | 21 | %
Data processing and communications |  | 4,984 |  |  | 3,520 |  |  | 1,464 |  |  | 42 | %
Legal and professional services |  | 2,507 |  |  | 2,169 |  |  | 338 |  |  | 16 | %
Taxes, license and fees |  | 1,232 |  |  | 1,180 |  |  | 52 |  |  | 4 | %
Regulatory premiums |  | 1,221 |  |  | 1,176 |  |  | 45 |  |  | 4 | %
Net cost (benefit) of operation of other real estate owned (1) |  | (1,246 | ) |  | 146 |  |  | (1,392 | ) |  | (953 | )%
Amortization of intangibles |  | 1,817 |  |  | 1,580 |  |  | 237 |  |  | 15 | %
Other |  | 7,218 |  |  | 6,284 |  |  | 934 |  |  | 15 | %
Total all other noninterest expense |  | 27,634 |  |  | 26,048 |  |  | 1,586 |  |  | 6 | %
Total noninterest expense |  | $ | 66,734 |  |  | $ | 57,386 |  |  | $ | 9,348 |  |  | 16 | %

__________
(1) Reclassified to conform to the current period’s presentation. The reclassification was limited to removing the separate line item for “Net benefit of operation of covered other real estate owned” and including the prior period activity in the line item for net cost (benefit) of operation of other real estate owned.
The following table shows the impact of the acquisition-related expenses for the periods indicated to the various components of noninterest expense:

|  | Three Months Ended
|  | March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Acquisition-related expenses: |  |  |  |
Compensation and employee benefits |  | $ | 338 |  |  | $ | 581 |
Occupancy |  | 499 |  |  | 139 |
Advertising and promotion |  | 96 |  |  | — |
Data processing and communications |  | 1,558 |  |  | — |
Legal and professional fees |  | 392 |  |  | 187 |
Other |  | 91 |  |  | 59 |
Total impact of acquisition-related costs to noninterest expense (1) |  | $ | 2,974 |  |  | $ | 966 |

__________
(1) Of the $3.0 million in acquisition-related expenses recorded during the three months ended March 31, 2015, $2.9 million related to the recent acquisition of Intermountain and $72 thousand related to the acquisition of West Coast Bancorp (“West Coast”). The acquisition-related expenses recorded during the three months ended March 31, 2014 related only to the acquisition of West Coast.
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Total noninterest expense for the first quarter of 2015 was $66.7 million, an increase of $9.3 million from a year earlier. The increase from the prior year period was primarily due to additional ongoing noninterest expense stemming from the growth resulting from the Intermountain acquisition. Also contributing to the increase from the prior year period were acquisition-related expenses, which were $3.0 million during the current quarter compared to $966 thousand for the prior year period.
The following table presents selected items included in Other noninterest expense and the associated change from period to period:

|  | Three Months Ended March 31, |  | Increase (Decrease) Amount
|  | 2015 |  | 2014 |
|  | (in thousands)
Postage |  | $ | 808 |  |  | $ | 902 |  |  | $ | (94 | )
Software support & maintenance |  | 1,037 |  |  | 550 |  |  | 487 |
Supplies |  | 317 |  |  | 380 |  |  | (63 | )
Insurance |  | 396 |  |  | 402 |  |  | (6 | )
ATM Network |  | 393 |  |  | 289 |  |  | 104 |
Travel |  | 546 |  |  | 422 |  |  | 124 |
Employee expenses |  | 279 |  |  | 299 |  |  | (20 | )
Sponsorships and charitable contributions |  | 432 |  |  | 602 |  |  | (170 | )
Directors fees |  | 239 |  |  | 169 |  |  | 70 |
Federal Reserve Bank processing fees |  | 147 |  |  | 67 |  |  | 80 |
Investments in affordable housing projects expense |  | — |  |  | 266 |  |  | (266 | )
Investor relations |  | 61 |  |  | 38 |  |  | 23 |
Other personal property owned |  | 4 |  |  | (124 | ) |  | 128 |
FDIC clawback expense |  | 23 |  |  | 204 |  |  | (181 | )
Miscellaneous |  | 2,536 |  |  | 1,818 |  |  | 718 |
Total other noninterest expense |  | $ | 7,218 |  |  | $ | 6,284 |  |  | $ | 934 |

Other noninterest expense increased $934 thousand due to additional ongoing noninterest expense stemming from the growth resulting from the Intermountain acquisition. Partially offsetting the increase was a decrease in the amount recorded to noninterest expense related to investments in affordable housing projects. As a result of the adoption of ASU 2014-01 Accounting for Investments in Qualified Affordable Housing Projects, the expense related to investments in affordable housing projects is now recorded to provision for income taxes in the consolidated statements of income. For additional information, see Note 1 to the Consolidated Financial Statements in “Item 8. Financial Statements and Supplementary Data” in our 2014 Annual Report on Form 10-K.
Income Taxes
For the three months ended March 31, 2015 and 2014, we recorded an income tax provision of $10.8 million and $8.8 million, respectively, with an effective tax rate of 31% for both periods. Our effective tax rate remains lower than the statutory tax rate due to the amount of tax-exempt municipal securities held in the investment portfolio and tax-exempt earnings on bank owned life insurance. For additional information, please refer to the Company’s annual report on Form 10-K for the year ended December 31, 2014.
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FINANCIAL CONDITION
Total assets were $8.55 billion as of March 31, 2015, a decrease of $25.9 million from $8.58 billion at December 31, 2014. The decrease was primarily due to a decrease in investment securities, partially offset by an increase in cash and cash equivalents.
Investment Securities
At March 31, 2015, the Company held investment securities totaling $2.01 billion compared to $2.10 billion at December 31, 2014. All of our securities are classified as available for sale and carried at fair value. The decrease in the investment securities portfolio from year-end is due to $111.0 million in principal payments, maturities and sales and $5.5 million in premium amortization, partially offset by $11.4 million in purchases and a $14.0 million increase in fair value of securities in the portfolio. The average duration of our investment portfolio was approximately 3 years and 8 months at March 31, 2015. This duration takes into account calls, where appropriate, and consensus prepayment speeds.
The investment securities are used by the Company as a component of its balance sheet management strategies. From time-to-time, securities may be sold to reposition the portfolio in response to strategies developed by the Company’s asset liability committee. In accordance with our investment strategy, management monitors market conditions with a view to realize gains on its available for sale securities portfolio when prudent.
The Company performs a quarterly assessment of the debt and equity securities in its investment portfolio that have an unrealized loss to determine whether the decline in the fair value of these securities below their amortized cost basis is other-than-temporary. Impairment is considered other-than-temporary when it becomes probable that the Company will be unable to recover the entire amortized cost basis of its investment. The Company’s impairment assessment takes into consideration factors such as the length of time and the extent to which the market value has been less than cost, defaults or deferrals of scheduled interest or principal, external credit ratings and recent downgrades, internal assessment of credit quality, and whether the Company intends to sell the security and whether it is more likely than not it will be required to sell the security prior to recovery of its amortized cost basis. If a decline in fair value is judged to be other-than-temporary, the cost basis of the individual security is written down to fair value which then becomes the new cost basis. The new cost basis is not adjusted for subsequent recoveries in fair value.
When there are credit losses associated with an impaired debt security and the Company does not have the intent to sell the security and it is more likely than not that it will not have to sell the security before recovery of its cost basis, the Company will separate the amount of the impairment into the amount that is credit-related and the amount related to non-credit factors. The credit-related impairment is recognized in earnings and the non-credit-related impairment is recognized in accumulated other comprehensive income.
At March 31, 2015, the market value of securities available for sale had a net unrealized gain of $25.2 million compared to a net unrealized gain of $11.2 million at December 31, 2014. The change in valuation was the result of fluctuations in market interest rates subsequent to purchase. At March 31, 2015, the Company had $587.4 million of investment securities with gross unrealized losses of $6.6 million; however, we did not consider these investment securities to be other-than-temporarily impaired.
The following table sets forth our securities portfolio by type for the dates indicated:

|  | March 31, 2015 |  | December 31, 2014
|  | (in thousands)
Securities Available for Sale |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations |  | $ | 1,102,700 |  |  | $ | 1,162,387 |
State and municipal securities |  | 501,671 |  |  | 496,484 |
U.S. government and government-sponsored enterprise securities |  | 376,798 |  |  | 413,706 |
U.S. government securities |  | 20,778 |  |  | 20,499 |
Other securities |  | 5,212 |  |  | 5,181 |
Total |  | $ | 2,007,159 |  |  | $ | 2,098,257 |

For further information on our investment portfolio, see Note 4 of the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.
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Credit Risk Management
The extension of credit in the form of loans or other credit substitutes to individuals and businesses is one of our principal commerce activities. Our policies, applicable laws, and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies, and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.
In analyzing our existing portfolio, we review our consumer and residential loan portfolios by their performance as a pool of loans, since no single loan is individually significant or judged by its risk rating, size or potential risk of loss. In contrast, the monitoring process for the commercial business, real estate construction, and commercial real estate portfolios includes periodic reviews of individual loans with risk ratings assigned to each loan and performance judged on a loan-by-loan basis.
We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. In the event that full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan. For additional discussion on our methodology in managing credit risk within our loan portfolio, see the following: “Allowance for Loan and Lease Losses” section in this Management’s Discussion and Analysis and Note 1 to the Consolidated Financial Statements in “Item 8. Financial Statements and Supplementary Data” of the Company’s 2014 Annual Report on Form 10-K.
Loan policies, credit quality criteria, portfolio guidelines and other controls are established under the guidance of our Chief Credit Officer and approved, as appropriate, by the board of directors. Credit Administration, together with the management loan committee, has the responsibility for administering the credit approval process. As another part of its control process, we use an internal credit review and examination function to provide reasonable assurance that loans and commitments are made and maintained as prescribed by our credit policies. This includes a review of documentation when the loan is initially extended and subsequent examination to ensure continued performance and proper risk assessment.
Loan Portfolio Analysis
Our wholly owned banking subsidiary Columbia State Bank (“Columbia Bank” or the “Bank”) is a full service commercial bank, which originates a wide variety of loans, and focuses its lending efforts on originating commercial business and commercial real estate loans.
The following table sets forth the Company’s loan portfolio by type of loan for the dates indicated:

|  | March 31, 2015 |  | % of Total |  | December 31, 2014 |  | % of Total
|  | (dollars in thousands)
Commercial business |  | $ | 2,139,873 |  |  | 39.3 | % |  | $ | 2,119,565 |  |  | 38.9 | %
Real estate: |  |  |  |  |  |  |  |
One-to-four family residential |  | 173,739 |  |  | 3.2 | % |  | 175,571 |  |  | 3.2 | %
Commercial and multifamily residential |  | 2,374,454 |  |  | 43.5 | % |  | 2,363,541 |  |  | 43.5 | %
Total real estate |  | 2,548,193 |  |  | 46.7 | % |  | 2,539,112 |  |  | 46.7 | %
Real estate construction: |  |  |  |  |  |  |  |
One-to-four family residential |  | 124,017 |  |  | 2.3 | % |  | 116,866 |  |  | 2.1 | %
Commercial and multifamily residential |  | 119,880 |  |  | 2.2 | % |  | 134,443 |  |  | 2.5 | %
Total real estate construction |  | 243,897 |  |  | 4.5 | % |  | 251,309 |  |  | 4.6 | %
Consumer |  | 352,960 |  |  | 6.5 | % |  | 364,182 |  |  | 6.7 | %
Purchased credit impaired |  | 219,839 |  |  | 4.0 | % |  | 230,584 |  |  | 4.2 | %
Subtotal |  | 5,504,762 |  |  | 101.0 | % |  | 5,504,752 |  |  | 101.1 | %
Less: Net unearned income |  | (53,867 | ) |  | (1.0 | )% |  | (59,374 | ) |  | (1.1 | )%
Loans, net of unearned income (before Allowance for Loan and Lease Losses) |  | $ | 5,450,895 |  |  | 100.0 | % |  | $ | 5,445,378 |  |  | 100.0 | %
Loans held for sale |  | $ | 3,545 |  |  |  |  | $ | 1,116 |  |  |

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Total loans increased $5.5 million from year-end 2014. The loan portfolio continues to be diversified, with the intent to mitigate risk by minimizing concentration in any one segment. The $53.9 million in unearned income recorded at March 31, 2015 was comprised of $45.4 million in discount on acquired loans and $8.5 million in deferred loan fees. The $59.4 million in unearned income recorded at December 31, 2014 consisted of $50.8 million in discount on acquired loans and $8.6 million in deferred loan fees.
The following table provides additional detail related to the net discount of acquired and purchased loans, excluding PCI loans, by acquisition:

|  | March 31, 2015 |  | December 31, 2014
Acquisition: |  | (dollars in thousands)
Intermountain |  | $ | 9,742 |  |  | $ | 10,453 |
West Coast |  | 36,010 |  |  | 40,623 |
Other (premium) |  | (336 | ) |  | (303 | )
Total net discount at period end |  | 45,416 |  |  | 50,773 |

Commercial Loans: We are committed to providing competitive commercial lending in our primary market areas. Management expects a continued focus within its commercial lending products and to emphasize, in particular, relationship banking with businesses, and business owners.
Real Estate Loans: One-to-four family residential loans are secured by properties located within our primary market areas and, typically, have loan-to-value ratios of 80% or lower at origination. Our underwriting standards for commercial and multifamily residential loans generally require that the loan-to-value ratio for these loans not exceed 75% of appraised value, cost, or discounted cash flow value, as appropriate, and that commercial properties maintain debt coverage ratios (net operating income divided by annual debt servicing) of 1.2 or better. However, underwriting standards can be influenced by competition and other factors. We endeavor to maintain the highest practical underwriting standards while balancing the need to remain competitive in our lending practices.
Real Estate Construction Loans: We originate a variety of real estate construction loans. Underwriting guidelines for these loans vary by loan type but include loan-to-value limits, term limits and loan advance limits, as applicable. Our underwriting guidelines for commercial and multifamily residential real estate construction loans generally require that the loan-to-value ratio not exceed 75% and stabilized debt coverage ratios (net operating income divided by annual debt servicing) of 1.2 or better. As noted above, underwriting standards can be influenced by competition and other factors. However, we endeavor to maintain the highest practical underwriting standards while balancing the need to remain competitive in our lending practices.
Consumer Loans: Consumer loans include automobile loans, boat and recreational vehicle financing, home equity and home improvement loans and miscellaneous personal loans.
Foreign Loans: The Company has no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.
Purchased Credit Impaired Loans: PCI loans are comprised of loans and loan commitments acquired in connection with the 2011 FDIC-assisted acquisitions of First Heritage Bank and Summit Bank, as well as the 2010 FDIC-assisted acquisitions of Columbia River Bank and American Marine Bank. PCI loans are generally accounted for under ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (“ASC 310-30”).
For additional information on our loan portfolio, including amounts pledged as collateral on borrowings, see Note 5 and Note 8 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.
Nonperforming Assets
Nonperforming assets consist of: (i) nonaccrual loans, which generally are loans placed on a nonaccrual basis when the loan becomes past due 90 days or when there are otherwise serious doubts about the collectability of principal or interest within the existing terms of the loan, (ii) OREO; and (iii) other personal property owned, if applicable.
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Nonaccrual loans: The Consolidated Financial Statements are prepared according to the accrual basis of accounting. This includes the recognition of interest income on the loan portfolio, unless a loan is placed on nonaccrual status, which occurs when there are serious doubts about the collectability of principal or interest. Our policy is generally to discontinue the accrual of interest on all loans past due 90 days or more and place them on nonaccrual status. Loans accounted for under ASC 310-30 are generally considered accruing and performing as the loans accrete interest income over the estimated lives of the loans when cash flows are reasonably estimable. Accordingly, PCI loans accounted for under ASC 310-30 that are contractually past due are still considered to be accruing and performing loans.
The following table set forth, at the dates indicated, information with respect to our nonaccrual loans and total nonperforming assets:

|  | March 31, 2015 |  | December 31, 2014
|  | (in thousands)
Nonperforming assets |  |  |  |
Nonaccrual loans: |  |  |  |
Commercial business |  | $ | 17,429 |  |  | $ | 16,799 |
Real estate: |  |  |  |
One-to-four family residential |  | 4,429 |  |  | 2,822 |
Commercial and multifamily residential |  | 4,498 |  |  | 7,847 |
Total real estate |  | 8,927 |  |  | 10,669 |
Real estate construction: |  |  |  |
One-to-four family residential |  | 2,134 |  |  | 465 |
Commercial and multifamily residential |  | 470 |  |  | 480 |
Total real estate construction |  | 2,604 |  |  | 945 |
Consumer |  | 2,868 |  |  | 2,939 |
Total nonaccrual loans |  | 31,828 |  |  | 31,352 |
Other real estate owned and other personal property owned |  | 23,347 |  |  | 22,225 |
Total nonperforming assets |  | $ | 55,175 |  |  | $ | 53,577 |
Loans, net of unearned income |  | $ | 5,450,895 |  |  | $ | 5,445,378 |
Total assets |  | $ | 8,552,902 |  |  | $ | 8,578,846 |
Nonperforming loans to period end loans |  | 0.58 | % |  | 0.58 | %
Nonperforming assets to period end assets |  | 0.65 | % |  | 0.62 | %

At March 31, 2015, nonperforming assets were $55.2 million, compared to $53.6 million at December 31, 2014. Nonperforming assets increased $1.6 million during the three months ended March 31, 2015 as a result of a $476 thousand increase in nonaccrual loans and a $1.1 million increase in OREO, most of which came from the PCI portfolio.
Other Real Estate Owned: During the three months ended March 31, 2015, OREO increased $1.1 million. The following table sets forth activity in OREO for the periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance, beginning of period |  | $ | 22,190 |  |  | $ | 35,927 |
Transfers in |  | 4,692 |  |  | 5,751 |
Valuation adjustments |  | (197 | ) |  | (1,580 | )
Proceeds from sale of OREO property |  | (5,122 | ) |  | (11,205 | )
Gain on sale of OREO, net |  | 1,736 |  |  | 1,659 |
Balance, end of period |  | $ | 23,299 |  |  | $ | 30,552 |

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Allowance for Loan and Lease Losses
Loans, excluding Purchased Credit Impaired Loans
We maintain an ALLL to absorb losses inherent in the loan portfolio. The size of the ALLL is determined through quarterly assessments of the probable estimated losses in the loan portfolio. Our methodology for making such assessments and determining the adequacy of the ALLL includes the following key elements:

1. | General valuation allowance consistent with the Contingencies topic of the FASB ASC.

2. | Classified loss reserves on specific relationships. Specific allowances for identified problem loans are determined in accordance with the Receivables topic of the FASB ASC.

3. | The unallocated allowance provides for other factors inherent in our loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed quarterly based on trends in credit losses, the results of credit reviews and overall economic trends.

On a quarterly basis, our Chief Credit Officer reviews with executive management and the board of directors the various additional factors that management considers when determining the adequacy of the ALLL, including economic and business condition reviews. Factors which influenced management’s judgment in determining the amount of the additions to the ALLL charged to operating expense include the following as of the applicable balance sheet dates:

• | Existing general economic and business conditions affecting our market place

• | Credit quality trends

• | Historical loss experience

• | Seasoning of the loan portfolio

• | Bank regulatory examination results

• | Findings of internal credit examiners

• | Duration of current business cycle

• | Specific loss estimates for problem loans

The ALLL is increased by provisions for loan and lease losses (“provision”) charged to expense, and is reduced by loans charged off, net of recoveries or recapture of previous provision. While we believe the best information available is used by us to determine the ALLL, changes in market conditions could result in adjustments to the ALLL, affecting net income, if circumstances differ from the assumptions used in determining the ALLL.
In addition to the ALLL, we maintain an allowance for unfunded commitments and letters of credit. We report this allowance as a liability on our Consolidated Balance Sheet. We determine this amount using estimates of the probability of the ultimate funding and losses related to those credit exposures. This methodology is similar to the methodology we use for determining the adequacy of our ALLL. For additional information on our allowance for unfunded commitments and letters of credit, see Note 6 to the Consolidated Financial Statements presented elsewhere in this report.
Purchased Credit Impaired Loans
PCI loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. PCI loans that have common risk characteristics are aggregated into pools. The Company re-measures contractual and expected loan cash flows, at the pool-level, on a quarterly basis. If, due to credit deterioration, the present value of expected cash flows, as periodically re-measured, is less than the carrying value of the loan pool, the Company adjusts the carrying value of the loan pool to the lower amount by adjusting the ALLL with a charge to earnings through the provision for loan losses. If the present value of expected cash flows is greater than the carrying value of the loan pool, the Company adjusts the carrying value of the loan pool to a higher amount by recapturing previously recorded allowance for loan losses, if any.
At March 31, 2015, our ALLL was $70.2 million, or 1.29% of total loans (excluding loans held for sale). This compares with an ALLL of $69.6 million, or 1.28% of total loans (excluding loans held for sale) at December 31, 2014 and an ALLL of $70.6 million or 1.54% of total loans (excluding loans held for sale) at March 31, 2014.
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The following table provides an analysis of the Company’s ALLL for loans at the dates and the periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Beginning balance |  | $ | 69,569 |  |  | $ | 72,454 |
Charge-offs: |  |  |  |
Commercial business |  | (1,426 | ) |  | (233 | )
One-to-four family residential |  | (8 | ) |  | (207 | )
Commercial and multifamily residential |  | — |  |  | (1,023 | )
Consumer |  | (891 | ) |  | (727 | )
Purchased credit impaired |  | (4,100 | ) |  | (4,273 | )
Total charge-offs |  | (6,425 | ) |  | (6,463 | )
Recoveries: |  |  |  |
Commercial business |  | 618 |  |  | 490 |
One-to-four family residential |  | 12 |  |  | 28 |
Commercial and multifamily residential |  | 3,261 |  |  | 39 |
One-to-four family residential construction |  | 28 |  |  | 42 |
Commercial and multifamily residential construction |  | 3 |  |  | — |
Consumer |  | 273 |  |  | 253 |
Purchased credit impaired |  | 1,686 |  |  | 1,806 |
Total recoveries |  | 5,881 |  |  | 2,658 |
Net charge-offs |  | (544 | ) |  | (3,805 | )
Provision for loan and lease losses |  | 1,209 |  |  | 1,922 |
Ending balance |  | $ | 70,234 |  |  | $ | 70,571 |
Total loans, net at end of period, excluding loans held of sale |  | $ | 5,450,895 |  |  | $ | 4,577,363 |
Allowance for loan and lease losses to period-end loans |  | 1.29 | % |  | 1.54 | %
Allowance for unfunded commitments and letters of credit |  |
Beginning balance |  | $ | 2,655 |  |  | $ | 2,505 |
Net changes in the allowance for unfunded commitments and letters of credit |  | — |  |  | 150 |
Ending balance |  | $ | 2,655 |  |  | $ | 2,655 |

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FDIC Loss-sharing Asset
The Company has elected to account for amounts receivable under loss-sharing agreements with the FDIC as an indemnification asset in accordance with the Business Combinations topic of the FASB ASC. The FDIC indemnification asset is initially recorded at fair value, based on the discounted expected future cash flows under the loss-sharing agreements.
Subsequent to initial recognition, the FDIC indemnification asset is reviewed quarterly and adjusted for any changes in expected cash flows. These adjustments are measured on the same basis as the related covered loans. Any decrease in expected cash flows on the covered loans due to an increase in expected credit losses will increase the FDIC indemnification asset and any increase in expected future cash flows on the covered loans due to a decrease in expected credit losses will decrease the FDIC indemnification asset. Changes in the estimated cash flows on covered assets that are immediately recognized in income generally result in a similar immediate adjustment to the loss-sharing asset while changes in expected cash flows on covered assets that are accounted for as an adjustment to yield generally result in adjustments to the amortization or accretion rate for the loss-sharing asset. Increases and decreases to the FDIC loss-sharing asset are recorded as adjustments to noninterest income.
At March 31, 2015, the FDIC loss-sharing asset was $14.6 million, which was comprised of a $10.6 million FDIC indemnification asset and a $4.0 million FDIC receivable. The FDIC receivable represents the amounts due from the FDIC for claims related to covered losses the Company has incurred net of amounts due to the FDIC relating to shared recoveries.
The following table summarizes the activity related to the FDIC loss-sharing asset for the three months ended March 31, 2015 and 2014:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
|  | (in thousands)
Balance at beginning of period |  | $ | 15,174 |  |  | $ | 39,846 |
Adjustments not reflected in income: |  |  |  |
Cash payments to (from) the FDIC |  | (659 | ) |  | 1,678 |
FDIC reimbursable losses (recoveries), net |  | (21 | ) |  | 132 |
Adjustments reflected in income: |  |  |  |
Amortization, net |  | (2,294 | ) |  | (6,452 | )
Loan impairment |  | 1,532 |  |  | 1,938 |
Sale of other real estate |  | (420 | ) |  | (756 | )
Write-downs of other real estate |  | 1,071 |  |  | 516 |
Other |  | 261 |  |  | (65 | )
Balance at end of period |  | $ | 14,644 |  |  | $ | 36,837 |

For additional information on the FDIC loss-sharing asset, please see Note 8 to the Consolidated Financial Statements presented elsewhere in this report.
Liquidity and Sources of Funds
Our primary sources of funds are customer deposits. Additionally, we utilize advances from the FHLB of Seattle, the Federal Reserve Bank of San Francisco, and wholesale and retail repurchase agreements to supplement our funding needs. These funds, together with loan repayments, loan sales, retained earnings, equity and other borrowed funds are used to make loans, to acquire securities and other assets, and to fund continuing operations.
Columbia Bank is a member of the FHLB of Seattle. In 2014, the FHLB of Seattle entered into a merger agreement with the Federal Home Loan Bank of Des Moines (the “Des Moines Bank”). If the merger contemplated by that agreement is consummated, the FHLB of Seattle will merge with and into the Des Moines Bank, with the Des Moines Bank being the surviving entity. As a result, the Bank will become a member of the Des Moines Bank and its shares of FHLB stock will be converted into shares of stock of the Des Moines Bank.
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Deposit Activities
Our deposit products include a wide variety of transaction accounts, savings accounts and time deposit accounts. Core deposits (demand deposit, savings, money market accounts and certificates of deposit less than $100,000) increased $151.8 million since year-end 2014.
We have established a branch system to serve our consumer and business depositors. In addition, management’s strategy for funding asset growth is to make use of brokered and other wholesale deposits on an as-needed basis. The Company participates in the Certificate of Deposit Account Registry Service (CDARS®) program. CDARS® is a network that allows participating banks to offer extended FDIC deposit insurance coverage on time deposits. The Company also participates in a similar program to offer extended FDIC deposit insurance coverage on money market accounts. These extended deposit insurance programs are generally available only to existing customers and are not used as a means of generating additional liquidity. At March 31, 2015, CDARS® deposits and brokered money market deposits were $102.8 million, or 1% of total deposits, compared to $101.8 million at year-end 2014. The brokered deposits have varied maturities.
The following table sets forth the Company’s deposit base by type of product for the dates indicated:

|  | March 31, 2015 |  | December 31, 2014
|  | Balance |  | % of Total |  | Balance |  | % of Total
|  | (dollars in thousands)
Core deposits: |  |  |  |  |  |  |  |
Demand and other non-interest bearing |  | $ | 3,260,376 |  |  | 46.2 | % |  | $ | 2,651,373 |  |  | 38.3 | %
Interest bearing demand |  | 901,684 |  |  | 12.7 | % |  | 1,304,258 |  |  | 18.8 | %
Money market |  | 1,700,014 |  |  | 24.0 | % |  | 1,760,331 |  |  | 25.4 | %
Savings |  | 630,423 |  |  | 8.9 | % |  | 615,721 |  |  | 8.9 | %
Certificates of deposit less than $100,000 |  | 279,258 |  |  | 3.9 | % |  | 288,261 |  |  | 4.2 | %
Total core deposits |  | 6,771,755 |  |  | 95.7 | % |  | 6,619,944 |  |  | 95.6 | %
Certificates of deposit greater than $100,000 |  | 199,728 |  |  | 2.8 | % |  | 202,014 |  |  | 2.9 | %
Certificates of deposit insured by CDARS® |  | 18,430 |  |  | 0.3 | % |  | 18,429 |  |  | 0.3 | %
Brokered money market accounts |  | 84,336 |  |  | 1.2 | % |  | 83,402 |  |  | 1.2 | %
Subtotal |  | 7,074,249 |  |  | 100.0 | % |  | 6,923,789 |  |  | 100.0 | %
Premium resulting from acquisition date fair value adjustment |  | 716 |  |  |  |  | 933 |  |  |
Total deposits |  | $ | 7,074,965 |  |  |  |  | $ | 6,924,722 |  |  |

Borrowings
We rely on FHLB advances and FRB borrowings as another source of both short and long-term funding. FHLB advances and FRB borrowings are secured by bonds within our investment portfolio, and residential, commercial and commercial real estate loans. At March 31, 2015, we had FHLB advances of $36.6 million compared to $216.6 million at December 31, 2014.
We also utilize wholesale and retail repurchase agreements as a supplement to our funding sources. Our wholesale repurchase agreements are secured by mortgage-backed securities. At March 31, 2015 and December 31, 2014, we had term repurchase agreements of $25.0 million, which mature in 2018, and sweep-related repurchase agreements of $71.9 million and $80.1 million, respectively, which mature on a daily basis. Management anticipates we will continue to rely on FHLB advances, FRB borrowings, and wholesale and retail repurchase agreements in the future and we will use those funds primarily to make loans and purchase securities.
Contractual Obligations, Commitments & Off-Balance Sheet Arrangements
We are party to many contractual financial obligations, including repayment of borrowings, operating and equipment lease payments, off-balance sheet commitments to extend credit and investments in affordable housing partnerships. At March 31, 2015, we had commitments to extend credit of $1.73 billion compared to $1.62 billion at December 31, 2014.
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Capital Resources
Shareholders’ equity at March 31, 2015 was $1.24 billion, an increase from $1.23 billion at December 31, 2014. Shareholders’ equity was 15% of total period-end assets at March 31, 2015 and 14% at December 31, 2014.
Capital Ratios: Basel III capital requirements became effective on January 1, 2015. The new capital requirements, among other things, (i) introduce a new capital measure called “Common Equity Tier 1,” or CET1, (ii) specify that Tier 1 capital consists of CET1 and “Additional Tier 1 capital” instruments meeting specified requirements, (iii) define CET1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to CET1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments to capital as compared to existing regulations. Under the requirements that are now effective, the minimum capital ratios are now (i) 4.5% CET1 to risk-weighted assets, (ii) 6% Tier 1 capital to risk-weighted assets, (iii) 8% total capital to risk-weighted assets and (iv) 4% Tier 1 leverage. The Company and the Bank have made the one-time election to opt-out of including accumulated other comprehensive income items in regulatory capital calculations.
FDIC regulations set forth the qualifications necessary for a bank to be classified as “well capitalized”, primarily for assignment of FDIC insurance premium rates. To qualify as “well capitalized,” banks must have a CET1 risk-adjusted capital ratio of 6.5%, a Tier I risk-adjusted capital ratio of at least 8%, a total risk-adjusted capital ratio of at least 10% and a leverage ratio of at least 5%. Failure to qualify as “well capitalized” can negatively impact a bank’s ability to expand and to engage in certain activities.
The Company and its banking subsidiary qualify as “well-capitalized” at March 31, 2015. The following table presents the regulatory standards for adequately capitalized and well-capitalized institutions and the capital ratios for the Company and its banking subsidiary at March 31, 2015:

|  | Company |  | Columbia Bank |  | Requirements
|  | March 31, 2015 |  | March 31, 2015 |  | Adequately capitalized |  | Well- Capitalized
Common equity tier 1 (CET1) risk-based capital ratio |  | 12.50 | % |  | 12.37 | % |  | 4.50 | % |  | 6.50 | %
Tier 1 risk-based capital ratio |  | 12.53 | % |  | 12.37 | % |  | 6.00 | % |  | 8.00 | %
Total risk-based capital ratio |  | 13.63 | % |  | 13.47 | % |  | 8.00 | % |  | 10.00 | %
Leverage ratio |  | 10.29 | % |  | 9.76 | % |  | 4.00 | % |  | 5.00 | %

For additional information concerning the new Basel III capital requirements, including information regarding those requirements when fully phased in, see “Business-Regulatory Capital Requirements” in our 2014 Form 10-K. See Note 24, Regulatory Capital Requirements, in Item 8 of our 2014 Form 10-K for additional details related to our capital ratios as of December 31, 2014 based on capital requirements then in effect.
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Non-GAAP Financial Measures
The Company considers operating net interest margin (tax equivalent) to be an important measurement as it more closely reflects the ongoing operating performance of the Company. Despite the importance of the operating net interest margin (tax equivalent) to the Company, there is no standardized definition for it and, as a result, the Company’s calculations may not be comparable with other organizations. Also, there may be limits in the usefulness of this measure to investors. As a result, the Company encourages readers to consider its consolidated financial statements in their entirety and not to rely on any single financial measure.
The following table reconciles the Company’s calculation of the operating net interest margin (tax equivalent) to the net interest margin (tax equivalent) for the periods indicated:

|  | Three Months Ended March 31,
|  | 2015 |  | 2014
Operating net interest margin non-GAAP reconciliation: |  | (dollars in thousands)
Net interest income (tax equivalent) (1) |  | $ | 82,667 |  |  | $ | 75,788 |
Adjustments to arrive at operating net interest income (tax equivalent): |  |  |  |
Incremental accretion income on FDIC purchased credit impaired loans |  | (2,447 | ) |  | (6,489 | )
Incremental accretion income on other FDIC acquired loans |  | (117 | ) |  | (204 | )
Incremental accretion income on other acquired loans |  | (4,934 | ) |  | (5,615 | )
Premium amortization on acquired securities |  | 2,861 |  |  | 1,625 |
Interest reversals on nonaccrual loans |  | 650 |  |  | 287 |
Operating net interest income (tax equivalent) (1) |  | $ | 78,680 |  |  | $ | 65,392 |
Average interest earning assets |  | $ | 7,529,040 |  |  | $ | 6,244,692 |
Net interest margin (tax equivalent) (1) |  | 4.39 | % |  | 4.85 | %
Operating net interest margin (tax equivalent) (1) |  | 4.18 | % |  | 4.19 | %

__________
(1) Tax-exempt interest income has been adjusted to a tax equivalent basis. The amount of such adjustment was an addition to net interest income of $2.3 million and $1.8 million for the three months ended March 31, 2015 and 2014, respectively.
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Item 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

A number of measures are used to monitor and manage interest rate risk, including income simulations and interest sensitivity (gap) analysis. An income simulation model is the primary tool used to assess the direction and magnitude of changes in net interest income resulting from changes in interest rates. Basic assumptions in the model include prepayment speeds on mortgage-related assets, cash flows and maturities of other investment securities, loan and deposit volumes and pricing. These assumptions are inherently subjective and, as a result, the model cannot precisely estimate net interest income or precisely predict the impact of higher or lower interest rates on net interest income. Actual results will differ from simulated results due to timing, magnitude and frequency of interest rate changes and changes in market conditions and management strategies, among other factors. At March 31, 2015, based on the measures used to monitor and manage interest rate risk, there has not been a material change in the Company’s interest rate risk since December 31, 2014. For additional information, refer to Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Company’s 2014 Annual Report on Form 10-K.

Item 4. | CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures
An evaluation was carried out under the supervision and with the participation of the Company’s management, including the Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”), of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934). Based on that evaluation, the CEO and CFO have concluded that as of the end of the period covered by this report, our disclosure controls and procedures are effective in ensuring that the information required to be disclosed by us in the reports we file or submit under the Securities Exchange Act of 1934 is (i) accumulated and communicated to our management (including the CEO and CFO) to allow timely decisions regarding required disclosure, and (ii) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.
Changes in Internal Controls Over Financial Reporting
There was no change in our internal controls over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.
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PART II - OTHER INFORMATION

Item 1. | LEGAL PROCEEDINGS

On June 24, 2009, West Coast Trust, which as a result of our 2013 acquisition of West Coast Bancorp is now a subsidiary of the Company, was served with an Objection to Personal Representative’s Petition and Petition for Surcharge of Personal Representative in Linn County Circuit Court. The petitioners alleged a breach of fiduciary duty with respect to West Coast Trust’s prior sale of real property owned by the petitioner’s estate and sought relief in the form of a surcharge to West Coast Trust of $215.6 million. West Coast Trust filed a motion to dismiss on July 2, 2009, which was granted in a letter ruling dated September 15, 2009. Petitioners appealed and on October 8, 2014, the Court of Appeals of the State of Oregon affirmed the lower court’s ruling dismissing all claims against West Coast Trust. On November 12, 2014, the petitioners filed an Appellant’s Petition for Review with the Supreme Court of the State of Oregon, seeking review and reversal of the Court of Appeals’ decision and remand of the case to the circuit court for trial. On February 5, 2015, the Supreme Court of the State of Oregon denied the Petition for Review, effectively disposing of this matter in its entirety.
Item 1A. RISK FACTORS
Refer to Item 1A of Part I of the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 for a discussion of risk factors relating to the Company’s business. The Company believes that there has been no material change in its risk factors as previously disclosed in the Company’s Form 10-K.

Item 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) | Not applicable

(b) | Not applicable

(c) | The following table provides information about repurchases of common stock by the Company during the quarter ended March 31, 2015:

Period |  | Total Number of Common Shares Purchased (1) |  | Average Price Paid per Common Share |  | Total number of Shares Purchased as Part of Publicly Announced Plan (2) |  | Maximum Number of Remaining Shares That May Be Purchased at Period End Under the Plan (2)
1/1/2015 - 1/31/2015 |  | 510 |  |  | $ | 26.42 |  |  | — |  |  | — |
2/1/2015 - 2/28/2015 |  | 26,981 |  |  | 28.15 |  |  | — |  |  | — |
3/1/2015 - 3/31/2015 |  | 286 |  |  | 29.02 |  |  | — |  |  | — |
|  | 27,777 |  |  | $ | 28.12 |  |  | — |  |  |

(1) | Common shares repurchased by the Company during the quarter consist of cancellation of 27,777 shares of common stock to pay the shareholders’ withholding taxes.

(2) | The Company does not have a current share repurchase plan.

Item 3. | DEFAULTS UPON SENIOR SECURITIES

None.

Item 4. | MINE SAFETY DISCLOSURES

Not applicable.

Item 5. | OTHER INFORMATION

None.
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Item 6. | EXHIBITS

10.1*+ |  | Amendment to Employment Agreement effective February 27, 2015 among the Bank, the Company and Melanie J. Dressel
10.2*+ |  | First Amendment to the Second Amended and Restated Executive Supplemental Compensation Agreement, by and between the Bank and Melanie J. Dressel, effective February 27, 2015
10.3*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Clint E. Stein, effective February 27, 2015
10.4*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Andrew L. McDonald, effective February 27, 2015
10.5*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and David C. Lawson, effective February 27, 2015
10.6*+ |  | First Amendment to the Restated and Amended West Coast Bank Supplemental Executive Retirement Plan Agreement, by and among the Company (as successor-in-interest to West Coast Bancorp), Bank (as successor-in-interest to West Coast Bank) and Hadley S. Robbins, effective February 27, 2015
10.7*+ |  | Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Hadley S. Robbins, effective February 27, 2015
10.8*+ |  | Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Kumi Baruffi, effective February 27, 2015
31.1+ |  | Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2+ |  | Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32+ |  | Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101+ |  | The following financial information from Columbia Banking System, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 is formatted in XBRL: (i) the Unaudited Consolidated Balance Sheets, (ii) the Unaudited Consolidated Statements of Income, (iii) the Unaudited Consolidated Statements of Comprehensive Income, (iv) the Unaudited Consolidated Statements of Changes in Shareholders’ Equity, (v) the Unaudited Consolidated Statements of Cash Flows, and (vi) the Notes to Unaudited Consolidated Financial Statements.

* Management contract or compensatory plan or arrangement
+ Filed herewith
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

|  |  | COLUMBIA BANKING SYSTEM, INC.
Date: | May 6, 2015 |  | By |  | /s/ MELANIE J. DRESSEL
|  |  |  |  | Melanie J. Dressel
|  |  |  |  | President and Chief Executive Officer (Principal Executive Officer)
Date: | May 6, 2015 |  | By |  | /s/ CLINT E. STEIN
|  |  |  |  | Clint E. Stein
|  |  |  |  | Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date: | May 6, 2015 |  | By |  | /s/ BARRY S. RAY
|  |  |  |  | Barry S. Ray
|  |  |  |  | Senior Vice President and Chief Accounting Officer (Principal Accounting Officer)

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INDEX TO EXHIBITS

10.1*+ |  | Amendment to Employment Agreement effective February 27, 2015 among the Bank, the Company and Melanie J. Dressel
10.2*+ |  | First Amendment to the Second Amended and Restated Executive Supplemental Compensation Agreement, by and between the Bank and Melanie J. Dressel, effective February 27, 2015
10.3*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Clint E. Stein, effective February 27, 2015
10.4*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Andrew L. McDonald, effective February 27, 2015
10.5*+ |  | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and David C. Lawson, effective February 27, 2015
10.6*+ |  | First Amendment to the Restated and Amended West Coast Bank Supplemental Executive Retirement Plan Agreement, by and among the Company (as successor-in-interest to West Coast Bancorp), Bank (as successor-in-interest to West Coast Bank) and Hadley S. Robbins, effective February 27, 2015
10.7*+ |  | Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Hadley S. Robbins, effective February 27, 2015
10.8*+ |  | Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Kumi Baruffi, effective February 27, 2015
31.1+ |  | Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2+ |  | Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32+ |  | Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101+ |  | The following financial information from Columbia Banking System, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 is formatted in XBRL: (i) the Unaudited Consolidated Balance Sheets, (ii) the Unaudited Consolidated Statements of Income, (iii) the Unaudited Consolidated Statements of Comprehensive Income, (iv) the Unaudited Consolidated Statements of Changes in Shareholders’ Equity, (v) the Unaudited Consolidated Statements of Cash Flows, and (vi) the Notes to Unaudited Consolidated Financial Statements.

* Management contract or compensatory plan or arrangement
+ Filed herewith
57