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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows From Operating Activities |  |  |
Net income | $ 154,244 | $ 194,451 | $ 172,882
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for credit losses | 77,700 | 3,493 | 14,769
Stock-based compensation expense | 10,737 | 9,271 | 8,354
Depreciation, amortization and accretion | 14,893 | 34,213 | 32,971
Investment securities loss (gain), net | (16,710) | (2,132) | 89
Net realized loss (gain) on sale of premises and equipment and OPPO | (1,334) | (7,317) | 316
Net realized loss (gain) on sale and valuation adjustments of OREO | 34 | 602 | (1,218)
Gain on bank owned life insurance death benefit | 0 | (3,051) | 0
Originations of loans held for sale | (491,385) | (210,484) | (133,945)
Proceeds from sale of loans held-for-sale | 483,130 | 196,615 | 135,862
Change in Fair Value of Loans Held-for-sale | (508) | 0 | 0
Deferred income tax expense | (13,768) | 330 | 108
Net change in: |  |  |
Interest receivable | (7,992) | (1,516) | (4,442)
Interest payable | (933) | 632 | 164
Other assets | (48,539) | (23,464) | 2,176
Other liabilities | 32,791 | 14,308 | 6,679
Net cash provided by operating activities | 192,292 | 204,747 | 237,201
Cash Flows From Investing Activities |  |  |
Loans originated, net of principal collected | (619,543) | (291,857) | 2,069
Purchases of debt securities available for sale | (2,118,667) | (1,196,895) | (965,585)
Purchases of loans held for investment | 50,035 | 57,075 | 46,969
Purchases of premises and equipment | (8,720) | (8,447) | (11,328)
Purchases of Federal Home Loan Bank stock | (53,240) | (273,800) | (197,440)
Proceeds from Sale of Debt Securities, Available-for-sale | 194,697 | 259,554 | 32,330
Proceeds from sale of equity securities | 3,000 | 0 | 4,808
Proceeds from principal repayments and maturities of securities available for sale | 603,129 | 428,025 | 465,747
Proceeds from sales of premises and equipment | 2,948 | 8,634 | 16,030
Proceeds from redemption of Federal Home Loan Bank Stock | 91,080 | 251,640 | 181,920
Proceeds from sales of other real estate owned and other personal property owned | 1,074 | 6,506 | 7,261
Proceeds from bank owned life insurance death benefit | 1,050 | 8,265 | 5,074
Proceeds from Termination of Cash Flow Hedging Instrument | 34,442 | 0 | 0
Net cash used in investing activities | (1,918,785) | (865,450) | (506,083)
Cash Flows From Financing Activities |  |  |
Net increase (decrease) in deposits | 3,185,167 | 226,958 | (73,591)
Net increase in sweep repurchase agreements | 9,422 | 3,343 | 7,035
Proceeds from exercise of stock options and employee stock purchase plan | 2,028 | 2,025 | 1,857
Proceeds from Federal Home Loan Bank advances | 1,331,000 | 6,845,000 | 4,936,000
Proceeds from Federal Reserve Bank borrowings | 222,010 | 36,000 | 5,010
Proceeds from other borrowings | 9,222 | 100 | 0
Payments for Federal Home Loan Bank advances | (2,277,000) | (6,291,000) | (4,548,000)
Payments for Federal Reserve Bank borrowings | (222,010) | (36,000) | (5,010)
Payments for other borrowings | (9,222) | (100) | 0
Payments for common stock dividends | (95,509) | (101,911) | (83,440)
Repayment of junior subordinated debentures | 0 | 0 | 8,248
Repayment of term repurchase agreement | 0 | 0 | (25,000)
Payments for purchase of treasury stock | (20,000) | (50,834) | 0
Payments for purchase and retirement of common stock | 2,522 | 2,792 | 2,677
Net cash provided by financing activities | 2,132,586 | 630,789 | 203,936
Increase (decrease) in cash and cash equivalents | 406,093 | (29,914) | (64,946)
Cash and cash equivalents at beginning of period | 247,673 | 277,587 | 342,533
Supplemental Information: |  |  |
Interest paid | 18,631 | 35,916 | 18,066
Income taxes paid, net of refunds | 43,287 | 47,375 | 24,067
Non-cash investing and financing activities: |  |  |
Loans transferred to OREO | 1,033 | 386 | 1,200
Premises and equipment expenditures incurred but not yet paid | 302 | 451 | 195
Change in dividends payable on unvested shares included in other liabilities | $ 706 | $ 354 | $ 19

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- Definition The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire Federal Home Loan Bank (FHLB) stock. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
Name: | us-gaap_TransferToOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration