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Parent Company Condensed Financial Statements (Condensed Statement of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income | $ 84,898 | $ 132,660 | $ 118,330 | $ 169,736 | $ 110,734 | $ 110,143 | $ 103,284 | $ 107,516 | $ 505,624 | $ 431,677 | $ 384,677
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense |  |  |  |  |  |  |  |  | 33,856 | 26,966 | 261,214
Gains on sales of available-for-sale investment securities |  |  |  |  |  |  |  |  | (8,037) | (10,362) | (40,367)
Net change in other assets |  |  |  |  |  |  |  |  | 46,005 | 23,685 | (117,046)
Net change in other liabilities |  |  |  |  |  |  |  |  | (1,966) | 15,353 | 16,785
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 696,906 | 641,856 | 469,624
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net increase in investments in tax credit and other investments, net |  |  |  |  |  |  |  |  | (161,661) | (87,860) | (95,074)
Purchases of available-for-sale investment securities |  |  |  |  |  |  |  |  | (828,604) | (2,396,199) | (3,547,193)
Proceeds from the sale of available-for-sale investment securities |  |  |  |  |  |  |  |  | 832,844 | 1,275,645 | 1,669,334
Net cash used in investing activities |  |  |  |  |  |  |  |  | (2,500,455) | (1,792,660) | (3,627,881)
Proceeds from: |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to various stock compensation plans and agreements |  |  |  |  |  |  |  |  | 2,280 | 2,982 | 2,835
Payments for: |  |  |  |  |  |  |  |  |  |  |
Repurchase of vested shares due to employee tax liability |  |  |  |  |  |  |  |  | (12,940) | (3,225) | (5,964)
Other net financing activities |  |  |  |  |  |  |  |  | 0 | 1,055 | 3,291
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 2,068,460 | 1,680,360 | 3,490,306
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 296,089 | 517,616 | 321,002
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | 1,878,503 |  |  |  | 1,360,887 | 1,878,503 | 1,360,887 | 1,039,885
CASH AND CASH EQUIVALENTS, END OF YEAR | 2,174,592 |  |  |  | 1,878,503 |  |  |  | 2,174,592 | 1,878,503 | 1,360,887
Parent Company |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 505,624 | 431,677 | 384,677
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings of subsidiaries, principally bank |  |  |  |  |  |  |  |  | (245,262) | (330,006) | (387,966)
Amortization expenses |  |  |  |  |  |  |  |  | 6,158 | 14,094 | 22,870
Deferred income tax expense |  |  |  |  |  |  |  |  | 940 | 6,349 | 17,555
Gains on sales of available-for-sale investment securities |  |  |  |  |  |  |  |  | (326) | 0 | (20)
Net change in other assets |  |  |  |  |  |  |  |  | (3,341) | 39,929 | (42,292)
Net change in other liabilities |  |  |  |  |  |  |  |  | (560) | 794 | (15,887)
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 263,233 | 162,837 | (21,063)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net increase in investments in tax credit and other investments, net |  |  |  |  |  |  |  |  | (9,777) | (6,554) | (35,633)
Purchases of available-for-sale investment securities |  |  |  |  |  |  |  |  | (9,000) | 0 | 0
Proceeds from the sale of available-for-sale investment securities |  |  |  |  |  |  |  |  | 18,326 | 0 | 20
Net cash used in investing activities |  |  |  |  |  |  |  |  | (451) | (6,554) | (35,613)
Proceeds from: |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock pursuant to various stock compensation plans and agreements |  |  |  |  |  |  |  |  | 2,280 | 2,081 | 2,835
Payments for: |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | (15,000) | (20,000) | (20,000)
Repurchase of vested shares due to employee tax liability |  |  |  |  |  |  |  |  | (12,940) | (3,225) | (5,964)
Cash dividends on common stock |  |  |  |  |  |  |  |  | (116,820) | (115,828) | (115,641)
Other net financing activities |  |  |  |  |  |  |  |  | 0 | 1,055 | 3,291
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (142,480) | (135,917) | (135,479)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | 120,302 | 20,366 | (192,155)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR |  |  |  | $ 39,264 |  |  |  | $ 18,898 | 39,264 | 18,898 | 211,053
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 159,566 |  |  |  | $ 39,264 |  |  |  | $ 159,566 | $ 39,264 | $ 18,898

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