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PARENT COMPANY FINANCIAL STATEMENTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Assets |  |  |  |
Other assets | $ 367,610 | $ 324,369 |  |
Total assets | 21,283,652 | 20,997,298 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 568,505 | 615,222 |  |
Long-term obligations | 444,921 | 687,599 |  |
Other liabilities | 218,553 | 178,209 |  |
Stockholders' equity | 1,864,007 | 1,861,128 | 1,732,962 | 1,559,115
Total liabilities and shareholders' equity | 21,283,652 | 20,997,298 |  |
Income Statement [Abstract] |  |  |  |
Interest expense | 90,148 | 144,192 | 195,125 |
Net interest income (loss) | 914,688 | 870,967 | 774,243 |
Income tax benefit | 59,822 | 115,103 | 110,518 |
Net income | 134,348 | 195,028 | 193,044 |
OPERATING ACTIVITIES |  |  |  |
Net income | 134,348 | 195,028 | 193,044 |
Net amortization of premiums and accretion of discounts | (158,227) | (194,434) | (119,085) |
Gain on retirement of long-term obligations | 0 | (9,685) | 0 |
Securities (gains) losses | (2,277) | 288 | (1,952) |
Other than temporary impairment on securities | 0 | 0 |  |
Change in other assets | (17,617) | 89,979 | (6,810) |
Change in other liabilities | 23,967 | (1,541) | 21,455 |
INVESTING ACTIVITIES |  |  |  |
Net change in short-term borrowings | (101,717) | (283,440) | (500,217) |
Retirement of long-term obligations | (196,338) | (320,730) | (114,425) |
Repurchase of common stock | (103,624) | (24,387) | 0 |
Cash dividends paid | (15,398) | (12,499) | (12,521) |
Net change in cash | 48,929 | 130,623 | (20,064) |
Cash and due from banks at beginning of period | 590,801 | 460,178 | 480,242 |
Cash and due from banks at end of period | 639,730 | 590,801 | 460,178 |
Cash payments for |  |  |  |
Interest | 104,514 | 157,477 | 196,002 |
Income taxes | 66,453 | 91,465 | 187,183 |
Parent [Member] |  |  |  |
Assets |  |  |  |
Cash | 2,131 | 10,765 |  |
Investment securities | 237,765 | 235,617 |  |
Investment in subsidiaries | 1,969,600 | 2,031,229 |  |
Due from subsidiaries | 78,512 | 120,836 |  |
Other assets | 83,283 | 114,852 |  |
Total assets | 2,371,291 | 2,513,299 |  |
Liabilities and Shareholders' Equity |  |  |  |
Short-term borrowings | 399,047 | 375,396 |  |
Long-term obligations | 96,392 | 251,697 |  |
Other liabilities | 11,845 | 25,078 |  |
Stockholders' equity | 1,864,007 | 1,861,128 |  |
Total liabilities and shareholders' equity | 2,371,291 | 2,513,299 |  |
Income Statement [Abstract] |  |  |  |
Interest income | 1,353 | 1,345 | 1,524 |
Interest expense | 15,435 | 21,512 | 22,633 |
Net interest income (loss) | (14,082) | (20,167) | (21,109) |
Dividends from subsidiaries | 179,588 | 82,812 | 50,424 |
Other income (loss) | 2,843 | 9,699 | (314) |
Other operating expense | 6,384 | 5,298 | 2,343 |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 161,965 | 67,046 | 26,658 |
Income tax benefit | (8,417) | (5,531) | (8,343) |
Income before equity in undistributed net income of subsidiaries | 170,382 | 72,577 | 35,001 |
(Excess distributions) equity in undistributed net income of subsidiaries | (36,034) | 122,451 | 158,043 |
Net income | 134,348 | 195,028 | 193,044 |
OPERATING ACTIVITIES |  |  |  |
Net income | 134,348 | 195,028 | 193,044 |
Undistributed net income of subsidiaries | 36,034 | (122,451) | (158,043) |
Net amortization of premiums and accretion of discounts | 439 | 203 | (113) |
Gain on retirement of long-term obligations | 0 | (9,685) | 0 |
Securities (gains) losses | (2,274) | (62) | (44) |
Other than temporary impairment on securities | 45 | 26 | 421 |
Change in other assets | 30,761 | (20,951) | (30,443) |
Change in other liabilities | (10,148) | (1,925) | 1,409 |
Net cash provided by (Used in) Operating Activities | 189,205 | 40,183 | 6,231 |
INVESTING ACTIVITIES |  |  |  |
Net change in due from subsidiaries | 42,323 | 146,463 | 59,249 |
Purchases of investment securities | (111,409) | (220,387) | (75,180) |
Maturities and sales of investment securities | 112,625 | 75,151 | 65,991 |
Investment in subsidiaries | 9,298 | 0 | (14,000) |
Net Cash Provided by (Used in) Investing Activities | 52,837 | 1,227 | 36,060 |
Net change in short-term borrowings | 23,651 | 4,046 | (24,227) |
Retirement of long-term obligations | (155,305) | (11,815) | 0 |
Repurchase of common stock | (103,624) | (24,387) | 0 |
Cash dividends paid | (15,398) | (12,499) | (12,521) |
Net cash used by financing activities | (250,676) | (44,655) | (36,748) |
Net change in cash | (8,634) | (3,245) | 5,543 |
Cash and due from banks at beginning of period | 10,765 | 14,010 | 8,467 |
Cash and due from banks at end of period | 2,131 | 10,765 | 14,010 |
Cash payments for |  |  |  |
Interest | 25,574 | 20,677 | 22,003 |
Income taxes | $ 66,453 | $ 91,465 | $ 187,183 |

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