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Parent Company Financial Statements (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets |  |  |  |
Investment securities | $ 5,387,703,000 | $ 5,226,228,000 |  |
Other assets | 263,797,000 | 367,610,000 |  |
Total assets | 21,199,091,000 | 21,283,652,000 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 511,418,000 | 568,505,000 |  |
Long-term obligations | 510,769,000 | 444,921,000 |  |
Other liabilities | 116,785,000 | 218,553,000 |  |
Stockholders' equity | 2,076,675,000 | 1,864,007,000 | 1,861,128,000 | 1,732,962,000
Total liabilities and shareholders' equity | 21,199,091,000 | 21,283,652,000 |  |
Income Statement [Abstract] |  |  |  |
Interest expense | 56,618,000 | 90,148,000 | 144,192,000 |
Net interest income (loss) | 740,186,000 | 914,688,000 | 870,967,000 |
Income tax benefit | 96,965,000 | 59,822,000 | 115,103,000 |
Net income | 167,699,000 | 134,348,000 | 195,028,000 |
OPERATING ACTIVITIES |  |  |  |
Net income | 167,699,000 | 134,348,000 | 195,028,000 |
Net amortization of premiums and accretion of discounts | (115,060,000) | (158,227,000) | (194,434,000) |
Gain on retirement of long-term obligations | 0 | 0 | (9,685,000) |
Securities (gains) losses | 0 | (2,277,000) | 288,000 |
Gain on sale of other assets | (4,085,000) | 0 | 0 |
Other than temporary impairment on securities | 0 |  |  |
Change in other assets | 103,974,000 | (17,617,000) | 89,979,000 |
Change in other liabilities | 56,998,000 | 23,967,000 | (1,541,000) |
INVESTING ACTIVITIES |  |  |  |
Net change in short-term borrowings | (57,087,000) | (101,717,000) | (283,440,000) |
Retirement of long-term obligations | (4,152,000) | (196,338,000) | (320,730,000) |
Repurchase of common stock | (321,000) | (103,624,000) | (24,387,000) |
Cash dividends paid | (8,663,000) | (15,398,000) | (12,499,000) |
Net change in cash | (106,131,000) | 48,929,000 | 130,623,000 |
Cash and due from banks at beginning of period | 639,730,000 | 590,801,000 | 460,178,000 |
Cash and due from banks at end of period | 533,599,000 | 639,730,000 | 590,801,000 |
Cash payments for |  |  |  |
Interest | 59,234,000 | 104,514,000 | 157,477,000 |
Income taxes | 102,890,000 | 66,453,000 | 91,465,000 |
Parent [Member] |  |  |  |
Assets |  |  |  |
Cash | 13,047,000 | 2,131,000 |  |
Investment securities | 234,488,000 | 237,765,000 |  |
Investment in subsidiaries | 2,058,505,000 | 1,969,600,000 |  |
Due from subsidiaries | 145,666,000 | 78,512,000 |  |
Other assets | 144,998,000 | 83,283,000 |  |
Total assets | 2,596,704,000 | 2,371,291,000 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 411,907,000 | 399,047,000 |  |
Long-term obligations | 96,392,000 | 96,392,000 |  |
Other liabilities | 11,730,000 | 11,845,000 |  |
Stockholders' equity | 2,076,675,000 | 1,864,007,000 |  |
Total liabilities and shareholders' equity | 2,596,704,000 | 2,371,291,000 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 1,387,000 | 1,353,000 | 1,345,000 |
Interest expense | 7,065,000 | 15,435,000 | 21,512,000 |
Net interest income (loss) | (5,678,000) | (14,082,000) | (20,167,000) |
Dividends from subsidiaries | 131,006,000 | 179,588,000 | 82,812,000 |
Other income (loss) | 3,620,000 | 2,843,000 | 9,699,000 |
Other operating expense | 2,344,000 | 6,384,000 | 5,298,000 |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 126,604,000 | 161,965,000 | 67,046,000 |
Income tax benefit | (2,095,000) | (8,417,000) | (5,531,000) |
Income before equity in undistributed net income of subsidiaries | 128,699,000 | 170,382,000 | 72,577,000 |
(Excess distributions) equity in undistributed net income of subsidiaries | 39,000,000 | (36,034,000) | 122,451,000 |
Net income | 167,699,000 | 134,348,000 | 195,028,000 |
OPERATING ACTIVITIES |  |  |  |
Net income | 167,699,000 | 134,348,000 | 195,028,000 |
Undistributed net income of subsidiaries | (39,000,000) | 36,034,000 | (122,451,000) |
Net amortization of premiums and accretion of discounts | 334,000 | 439,000 | 203,000 |
Gain on retirement of long-term obligations | 0 | 0 | (9,685,000) |
Securities (gains) losses | 0 | (2,274,000) | (62,000) |
Gain on sale of other assets | (1,331,000) | 0 | 0 |
Other than temporary impairment on securities | 0 | 45,000 | 26,000 |
Change in other assets | (61,704,000) | 30,761,000 | (20,951,000) |
Change in other liabilities | (2,096,000) | (10,148,000) | (1,925,000) |
Net cash provided by (Used in) Operating Activities | 63,902,000 | 189,205,000 | 40,183,000 |
INVESTING ACTIVITIES |  |  |  |
Net change in due from subsidiaries | (67,154,000) | 42,323,000 | 146,463,000 |
Purchases of investment securities | (126,197,000) | (111,409,000) | (220,387,000) |
Maturities and sales of investment securities | 135,000,000 | 112,625,000 | 75,151,000 |
Investment in subsidiaries | 1,489,000 | 9,298,000 | 0 |
Net Cash Provided by (Used in) Investing Activities | (56,862,000) | 52,837,000 | 1,227,000 |
Net change in short-term borrowings | 12,860,000 | 23,651,000 | 4,046,000 |
Retirement of long-term obligations | 0 | (155,305,000) | (11,815,000) |
Repurchase of common stock | (321,000) | (103,624,000) | (24,387,000) |
Cash dividends paid | (8,663,000) | (15,398,000) | (12,499,000) |
Net cash used by financing activities | 3,876,000 | (250,676,000) | (44,655,000) |
Net change in cash | 10,916,000 | (8,634,000) | (3,245,000) |
Cash and due from banks at beginning of period | 2,131,000 | 10,765,000 | 14,010,000 |
Cash and due from banks at end of period | 13,047,000 | 2,131,000 | 10,765,000 |
Cash payments for |  |  |  |
Interest | 6,904,000 | 25,574,000 | 20,677,000 |
Income taxes | $ 102,890,000 | $ 66,453,000 | $ 91,465,000 |

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