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Consolidated Statements of Cash Flows | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Cash Flows from Operating Activities |  |  |
Net income | $ 271,885,000 | $ 176,042,000 | $ 175,099,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Reversal for credit losses | (4,500,000) | (2,500,000) | (15,650,000)
Provision for losses on other real estate owned |  | 691,000 | 176,000
Deferred tax provision | 2,343,000 | 34,554,000 | 15,949,000
Depreciation and amortization | 7,314,000 | 7,265,000 | 7,490,000
Net gains on sale and transfers of other real estate owned | (1,187,000) | (2,661,000) | (546,000)
Net gains on sale of loans |  |  | (285,000)
Proceeds from sale of loans | 8,000,000 | 7,500,000 | 20,079,000
Originations of loans held for sale |  |  | (12,665,000)
Loss on sales or disposal of fixed assets | 107,000 |  |
Amortization of alternative energy partnerships, venture capital and other investments | 40,871,000 | 4,572,000 | 28,897,000
Write-down on impaired securities |  |  | 206,000
Gain on sales and calls of securities | (22,000) | (1,006,000) | (5,104,000)
Other non-cash interest income | (1,576,000) | (1,740,000) | (1,272,000)
Amortization of security premiums, net | 3,018,000 | 2,945,000 | 6,371,000
Unrealized loss on equity securities | 2,787,000 |  |
Stock based and stock issued to officers and directors compensation expense | 7,974,000 | 5,734,000 | 4,963,000
Net change in accrued interest receivable and other assets | (13,984,000) | 25,747,000 | 13,478,000
Gain from acquisition | (340,000) | (5,628,000) |
Net change in other liabilities | 13,848,000 | (2,641,000) | (2,784,000)
Net cash provided by operating activities | 336,538,000 | 248,874,000 | 234,402,000
Cash Flows from Investing Activities |  |  |
Decrease in interest bearing deposits | 5,000,000 |  |
Purchase of investment securities available-for-sale | (497,787,000) | (339,814,000) | (941,327,000)
Proceeds from maturity and call of investment securities available-for-sale | 341,900,000 | 490,950,000 | 460,000,000
Proceeds from sale of investment securities available-for-sale | 99,899,000 | 111,704,000 | 294,000
Purchase of mortgage-backed securities available-for-sale |  | (267,760,000) |
Proceeds from repayment and sale of mortgage-backed securities available-for-sale | 105,873,000 | 71,645,000 | 758,271,000
Purchase of Federal Home Loan Bank stock | (5,430,000) | (8,160,000) | (1,650,000)
Redemption of Federal Home Loan Bank stock | 11,265,000 | 13,482,000 | 1,650,000
Redemption of Federal Reserve Bank stock |  | 8,733,000 |
Net increase in loans | (1,125,623,000) | (963,858,000) | (1,051,952,000)
Purchase of premises and equipment | (6,670,000) | (3,188,000) | (3,523,000)
Proceeds from sales of premises and equipment |  | 5,598,000 | 12,000
Proceeds from sales of other real estate owned | 3,820,000 | 18,357,000 | 7,699,000
Increase in investment in affordable housing and alternative energy partnerships | (66,574,000) | (40,284,000) | (82,966,000)
Acquisitions, net of cash acquired |  | (1,392,000) |
Net cash used in investing activities | (1,134,327,000) | (903,987,000) | (853,492,000)
Cash Flows from Financing Activities |  |  |
Net increase in deposits | 1,012,284,000 | 201,224,000 | 1,166,044,000
Net decrease in federal funds purchased and securities sold under agreements to repurchase | (100,000,000) | (250,000,000) | (50,000,000)
Advances from Federal Home Loan Bank | 5,130,000,000 | 4,823,000,000 | 3,555,000,000
Repayment of Federal Home Loan Bank borrowings | (5,030,000,000) | (4,773,000,000) | (3,480,000,000)
Cash dividends | (83,428,000) | (69,888,000) | (59,274,000)
Purchase of treasury stock | (42,648,000) |  | (54,441,000)
Proceeds from issuance of long-term debt and other borrowings |  | 75,000,000 |
Repayment of long-term debt and other borrowings | (23,040,000) |  |
Proceeds from shares issued to Dividend Reinvestment Plan | 2,822,000 | 2,528,000 | 2,277,000
Proceeds from exercise of stock options | 838,000 | 1,094,000 | 7,661,000
Taxes paid related to net share settlement of RSUs | (3,550,000) | (5,128,000) | (103,000)
Net cash provided by financing activities | 863,278,000 | 4,830,000 | 1,087,164,000
Increase/(Decrease) in cash and cash equivalents | 65,489,000 | (650,283,000) | 468,074,000
Cash and cash equivalents, beginning of the year | 534,801,000 | 1,185,084,000 | 717,010,000
Cash and cash equivalents, end of the year | 600,290,000 | 534,801,000 | 1,185,084,000
Supplemental disclosure of cash flow information |  |  |
Interest | 116,524,000 | 81,069,000 | 81,793,000
Income taxes | 65,866,000 | 76,709,000 | 38,671,000
Non-cash investing and financing activities: |  |  |
Net change in unrealized holding (loss)/gain on securities available-for-sale, net of tax | (7,949,000) | 485,000 | 3,886,000
Net change in unrealized gain on interest rate swaps designated as cash flow hedges | 1,525,000 | 719,000 | 825,000
Transfers to other real estate owned from loans held for investment | 5,476,000 | 1,243,000 | 2,698,000
Loans transferred to loans held for sale |  | 8,000,000 | 7,953,000
Loans to facilitate the sale of other real estate owned |  | 10,500,000 | 2,616,000
Issuance of stock related to acquisition |  | 34,862,000 |
Business Acquired During the Period [Member] |  |  |
Supplemental disclosure for acquisitions |  |  |
Cash and cash equivalents |  | 283,932,000 |
Short-term investments |  | 5,000,000 |
Securities available-for-sale |  | 88,044,000 |
FHLB and FRB stock |  | 19,890,000 |
Loans |  | 705,792,000 |
Premises and equipment |  | 6,239,000 |
Cash surrender value of life insurance |  | 46,083,000 |
Deferred tax assets, net |  | 40,690,000 |
Core deposit intangible |  | 6,122,000 |
Accrued interest receivable and other assets |  | 10,689,000 |
Total assets acquired |  | 1,212,481,000 |
Deposits |  | 813,888,000 |
Advances from Federal Home Loan Bank |  | 30,000,000 |
Accrued interest payable and other liabilities |  | 8,512,000 |
Total liabilities assumed |  | 852,400,000 |
Net assets acquired |  | 360,081,000 |
Cash paid |  | 285,324,000 |
Fair value of common stock issued |  | 34,862,000 |
Total consideration paid |  | $ 320,186,000 |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3095-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784 + Details
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- Definition The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash inflow or outflow from investment sold under the agreement to reacquire such investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3095-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3461-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109127227&loc=d3e60097-112785 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + 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=109979856&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 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale of 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 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of loans receivables arising from the financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Value of loans held-for-sale transferred to loans held in the entity's portfolio 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 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: 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=98513485&loc=d3e4332-108586 Reference 3: 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=98513485&loc=d3e4313-108586 + Details
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