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PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 91,805 | $ 94,097 | $ 98,748 | $ 100,027 | $ 95,502 | $ 91,900 | $ 84,305 | $ 74,171 | $ 384,677 | [1] | $ 345,878 | [1] | $ 293,324 | [1]
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 46,202 |  | 82,553 |  | 75,814 |
Tax benefit from stock compensation plans, net |  |  |  |  |  |  |  |  | (3,291) |  | (6,513) |  | (5,522) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 469,624 |  | 392,898 |  | 425,845 |
Purchases of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities |  |  |  |  |  |  |  |  | (3,547,193) |  | (960,135) |  | (1,316,764) |
Proceeds from sale of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities |  |  |  |  |  |  |  |  | 1,669,334 |  | 623,689 |  | 663,569 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (3,627,881) |  | (2,359,893) |  | (2,734,846) |
Proceeds from: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to various stock plans and agreements |  |  |  |  |  |  |  |  | 2,835 |  | 6,794 |  | 3,054 |
Payments for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (20,000) |  | (30,310) |  | (10,310) |
Repurchase of vested shares due to employee tax liability |  |  |  |  |  |  |  |  | (5,964) |  | (10,326) |  | (13,833) |
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (199,992) |
Tax benefit from stock compensation plans, net |  |  |  |  |  |  |  |  | 3,291 |  | 6,513 |  | 5,522 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 3,490,306 |  | 2,111,060 |  | 1,881,715 |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 321,002 |  | 144,065 |  | (427,286) |
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | 1,039,885 |  |  |  | 895,820 | 1,039,885 |  | 895,820 |  | 1,323,106 |
CASH AND CASH EQUIVALENTS, END OF YEAR | 1,360,887 |  |  |  | 1,039,885 |  |  |  | 1,360,887 |  | 1,039,885 |  | 895,820 |
Cash paid during the year for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 105,831 |  | 112,695 |  | 112,169 |
Noncash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock to common stock |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 83,027 |
Issuance of common stock related to acquisition |  |  |  |  |  |  |  |  |  |  | 190,830 |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 384,677 |  | 345,878 |  | 293,324 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (387,965) |  | (317,620) |  | (289,309) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 22,870 |  | 46,365 |  | 8,806 |
Gains on sales of available-for-sale investment securities and other investments |  |  |  |  |  |  |  |  | (20) |  | (4,357) |  | (161) |
Tax benefit from stock compensation plans, net |  |  |  |  |  |  |  |  | (3,291) |  | (6,513) |  | (5,522) |
Net change in other assets and other liabilities |  |  |  |  |  |  |  |  | (37,334) |  | 186,382 |  | 293,112 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | (21,063) |  | 250,135 |  | 300,250 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in tax credit investments |  |  |  |  |  |  |  |  | (35,633) |  | (53,071) |  | (12,970) |
Purchases of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities |  |  |  |  |  |  |  |  | 0 |  | (9,000) |  | (69,986) |
Proceeds from sale of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment securities |  |  |  |  |  |  |  |  | 20 |  | 74,002 |  | 0 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (35,613) |  | 11,931 |  | (82,956) |
Proceeds from: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in long-term borrowings |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 100,000 |
Issuance of common stock pursuant to various stock plans and agreements |  |  |  |  |  |  |  |  | 2,835 |  | 6,794 |  | 3,054 |
Payments for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (20,000) |  | (30,310) |  | (10,310) |
Repurchase of vested shares due to employee tax liability |  |  |  |  |  |  |  |  | (5,964) |  | (10,326) |  | (13,833) |
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (199,992) |
Cash dividends on common stock |  |  |  |  |  |  |  |  | (115,641) |  | (103,618) |  | (82,862) |
Cash dividends on preferred stock |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (3,428) |
Tax benefit from stock compensation plans, net |  |  |  |  |  |  |  |  | 3,291 |  | 6,513 |  | 5,522 |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (135,479) |  | (130,947) |  | (201,849) |
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (192,155) |  | 131,119 |  | 15,445 |
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | $ 211,053 |  |  |  | $ 79,934 | 211,053 |  | 79,934 |  | 64,489 |
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 18,898 |  |  |  | $ 211,053 |  |  |  | 18,898 |  | 211,053 |  | 79,934 |
Cash paid during the year for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 4,254 |  | 4,462 |  | 3,292 |
Noncash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock to common stock |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 83,027 |
Issuance of common stock related to acquisition |  |  |  |  |  |  |  |  | $ 0 |  | $ 190,830 |  | $ 0 |
[1] | Prior period was restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects Accounting Standards Update (“ASU”) 2014-01. Please see Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements for additional information.

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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Value of stock issued pursuant to acquisitions during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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