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Parent Company Financial Statements (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets |  |  |  |
Overnight investments | $ 1,387,927,000 | $ 1,872,594,000 |  |
Investment securities | 7,180,180,000 | 7,006,580,000 |  |
Other assets | 686,371,000 | 471,412,000 |  |
Total assets | 34,527,512,000 | 32,990,836,000 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 693,807,000 | 603,487,000 |  |
Long-term obligations | 870,240,000 | 832,942,000 |  |
Other liabilities | 261,784,000 | 283,629,000 |  |
Stockholders' equity | 3,334,064,000 | 3,012,427,000 | $ 2,872,109,000 | $ 2,687,594,000
Total liabilities and shareholders' equity | 34,527,512,000 | 32,990,836,000 |  |
Income Statement [Abstract] |  |  |  |
Interest expense | 43,794,000 | 43,082,000 | 44,304,000 |
Net interest income (loss) | 1,059,896,000 | 944,675,000 | 924,905,000 |
Dividends from subsidiaries | 50,424,000 |  |  |
Income tax benefit | 219,946,000 | 125,585,000 | 122,028,000 |
Net income | 323,752,000 | 225,482,000 | 210,386,000 |
OPERATING ACTIVITIES |  |  |  |
Net income | 323,752,000 | 225,482,000 | 210,386,000 |
Net amortization of premiums and accretion of discounts | (40,028,000) | (44,618,000) | (85,066,000) |
Gain on elimination of acquired debt | (919,000) | (1,717,000) | 0 |
Securities (gains) losses | (4,293,000) | (26,673,000) | (10,817,000) |
Other than temporary impairment on securities | 0 |  |  |
Change in other assets | (46,920,000) | (27,873,000) | (12,904,000) |
Change in other liabilities | (29,542,000) | (25,520,000) | 14,458,000 |
INVESTING ACTIVITIES |  |  |  |
Net change in overnight investments | 586,279,000 | 233,433,000 | (338,213,000) |
Business acquisitions, net of cash acquired | 304,820,000 | (727,000) | 123,137,000 |
FINANCING ACTIVITIES |  |  |  |
Net change in short-term borrowings | (44,680,000) | (33,072,000) | (397,952,000) |
Retirement of long-term obligations | (6,955,000) | (9,279,000) | (5,896,000) |
Cash dividends paid | (10,809,000) | (14,412,000) | (18,015,000) |
Net change in cash | (203,591,000) | 5,655,000 | (70,096,000) |
Cash and due from banks at beginning of period | 539,741,000 | 534,086,000 | 604,182,000 |
Cash and due from banks at end of period | 336,150,000 | 539,741,000 | 534,086,000 |
Cash payments for |  |  |  |
Interest | 43,639,000 | 44,998,000 | 46,785,000 |
Income taxes | 88,565,000 | 108,741,000 | 136,900,000 |
Parent |  |  |  |
Assets |  |  |  |
Cash | 45,411,000 | 8,278,000 |  |
Overnight investments | 14,476,000 | 26,157,000 |  |
Investment securities | 117,513,000 | 95,564,000 |  |
Investment in Banking Subsidiaries | 3,203,491,000 | 2,932,048,000 |  |
Investment in Other Subsidiaries | 41,165,000 | 41,066,000 |  |
Due from subsidiaries | 4,000 | 0 |  |
Other assets | 46,674,000 | 43,077,000 |  |
Total assets | 3,468,734,000 | 3,146,190,000 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 15,000,000 | 0 |  |
Long-term obligations | 107,479,000 | 126,861,000 |  |
Due to Affiliate | 728,000 | 2,350,000 |  |
Other liabilities | 11,463,000 | 4,552,000 |  |
Stockholders' equity | 3,334,064,000 | 3,012,427,000 |  |
Total liabilities and shareholders' equity | 3,468,734,000 | 3,146,190,000 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 921,000 | 1,110,000 | 645,000 |
Interest expense | 4,814,000 | 6,067,000 | 6,793,000 |
Net interest income (loss) | (3,893,000) | (4,957,000) | (6,148,000) |
Dividends from subsidiaries |  | 90,055,000 | 75,000,000 |
Dividend Income, Banking Subsidiaries |  |  | 75,006,000 |
Dividends from subsidiaries | 0 | 0 | 23,500,000 |
Other income (loss) | 8,377,000 | 9,330,000 | 1,870,000 |
Other operating expense | 6,821,000 | 5,641,000 | 2,634,000 |
Income tax benefit | (5,395,000) | (730,000) | (2,618,000) |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 48,087,000 | 88,787,000 | 91,594,000 |
Excess distributions (undistributed ) net income of subsidiaries | (270,270,000) | (135,965,000) | (116,174,000) |
Net income | 323,752,000 | 225,482,000 | 210,386,000 |
Income before equity in undistributed net income of subsidiaries | 53,482,000 | 89,517,000 | 94,212,000 |
OPERATING ACTIVITIES |  |  |  |
Net income | 323,752,000 | 225,482,000 | 210,386,000 |
Excess distributions (undistributed ) net income of subsidiaries | (270,270,000) | (135,965,000) | (116,174,000) |
Net amortization of premiums and accretion of discounts | 759,000 | 398,000 | (2,712,000) |
Gain on elimination of acquired debt | (919,000) | (1,717,000) | 0 |
Securities (gains) losses | (8,003,000) | (9,446,000) | (236,000) |
Change in other assets | (10,509,000) | (980,000) | 22,663,000 |
Change in other liabilities | 2,707,000 | 2,483,000 | (1,157,000) |
Net cash provided by (Used in) Operating Activities | 37,517,000 | 80,255,000 | 112,770,000 |
INVESTING ACTIVITIES |  |  |  |
Net change in due from subsidiaries | (4,000) | 0 | 299,889,000 |
Net change in overnight investments | 11,681,000 | (24,741,000) | (1,416,000) |
Purchases of investment securities | (28,012,000) | (93,003,000) | (7,818,000) |
Maturities and sales of investment securities | 32,463,000 | 38,316,000 | 100,586,000 |
Net Cash Provided by (Used in) Investing Activities | 16,128,000 | (79,428,000) | 391,241,000 |
FINANCING ACTIVITIES |  |  |  |
Change in Due to Subsidiaries | (1,622,000) | 2,296,000 | 54,000 |
Net change in short-term borrowings | 0 | 0 | (485,207,000) |
Retirement of long-term obligations | (4,081,000) | (5,302,000) | 0 |
Cash dividends paid | (10,809,000) | (14,412,000) | (18,015,000) |
Net cash used by financing activities | (16,512,000) | (17,418,000) | (503,168,000) |
Net change in cash | 37,133,000 | (16,591,000) | 843,000 |
Cash and due from banks at beginning of period | 8,278,000 | 24,869,000 | 24,026,000 |
Cash and due from banks at end of period | $ 45,411,000 | $ 8,278,000 | $ 24,869,000 |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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