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Parent Holding Company Information (Condensed) (Tables) | 12 Months Ended
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Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Statements of Financial Condition |
(Dollars in thousands) | December 31, 2013 |  | December 31, 2012
Assets |  |  |
Cash on hand and in banks | $ | 1,582 |  |  | 2,540 |
Interest bearing cash deposits | 49,097 |  |  | 9,887 |
Cash and cash equivalents | 50,679 |  |  | 12,427 |
Investment securities, available-for-sale | 87 |  |  | 29,457 |
Other assets | 9,050 |  |  | 23,221 |
Investment in subsidiaries | 1,040,104 |  |  | 972,218 |
Total assets | $ | 1,099,920 |  |  | 1,037,323 |
Liabilities and Stockholders’ Equity |  |  |
Subordinated debentures | $ | 125,562 |  |  | 125,418 |
Other liabilities | 11,108 |  |  | 10,956 |
Total liabilities | 136,670 |  |  | 136,374 |
Common stock | 744 |  |  | 719 |
Paid-in capital | 690,918 |  |  | 641,737 |
Retained earnings | 261,943 |  |  | 210,531 |
Accumulated other comprehensive income | 9,645 |  |  | 47,962 |
Total stockholders’ equity | 963,250 |  |  | 900,949 |
Total liabilities and stockholders’ equity | $ | 1,099,920 |  |  | 1,037,323 |
Statements of Operations |
| Years ended
(Dollars in thousands) | December 31, 2013 |  | December 31, 2012 |  | December 31, 2011
Income |  |  |  |  |
Dividends from subsidiaries | $ | 65,445 |  |  | 78,209 |  |  | 43,450 |
Loss on sale of investments | (3,248 | ) |  | — |  |  | — |
Other income | 966 |  |  | 566 |  |  | 864 |
Intercompany charges for services | 7,387 |  |  | 16,041 |  |  | 14,438 |
Total income | 70,550 |  |  | 94,816 |  |  | 58,752 |
Expenses |  |  |  |  |
Compensation and employee benefits | 9,175 |  |  | 12,392 |  |  | 9,185 |
Other operating expenses | 6,536 |  |  | 10,267 |  |  | 11,827 |
Total expenses | 15,711 |  |  | 22,659 |  |  | 21,012 |
Income before income tax benefit and equity in undistributed net income (loss) of subsidiaries | 54,839 |  |  | 72,157 |  |  | 37,740 |
Income tax benefit | 3,676 |  |  | 2,319 |  |  | 2,176 |
Income before equity in undistributed net income (loss) of subsidiaries | 58,515 |  |  | 74,476 |  |  | 39,916 |
Equity in undistributed net income (loss) of subsidiaries | 37,129 |  |  | 1,040 |  |  | (22,825 | )
Net Income | $ | 95,644 |  |  | 75,516 |  |  | 17,091 |
Statements of Comprehensive Income |
| Years ended
(Dollars in thousands) | December 31, 2013 |  | December 31, 2012 |  | December 31, 2011
Net Income | $ | 95,644 |  |  | 75,516 |  |  | 17,091 |
Other Comprehensive (Loss) Income, Net of Tax |  |  |  |  |
Unrealized (losses) gains on available-for-sale securities | (81,739 | ) |  | 31,617 |  |  | 63,190 |
Reclassification adjustment for losses (gains) included in net income | 299 |  |  | — |  |  | (346 | )
Net unrealized (losses) gains on securities | (81,440 | ) |  | 31,617 |  |  | 62,844 |
Tax effect | 31,680 |  |  | (12,300 | ) |  | (24,444 | )
Net of tax amount | (49,760 | ) |  | 19,317 |  |  | 38,400 |
Unrealized gains (losses) on derivatives used for cash flow hedges | 18,728 |  |  | (7,926 | ) |  | (8,906 | )
Tax effect | (7,285 | ) |  | 3,084 |  |  | 3,465 |
Net of tax amount | 11,443 |  |  | (4,842 | ) |  | (5,441 | )
Total other comprehensive (loss) income, net of tax | (38,317 | ) |  | 14,475 |  |  | 32,959 |
Total Comprehensive Income | $ | 57,327 |  |  | 89,991 |  |  | 50,050 |
Statements of Cash Flows |
| Years ended
(Dollars in thousands) | December 31, 2013 |  | December 31, 2012 |  | December 31, 2011
Operating Activities |  |  |  |  |
Net income | $ | 95,644 |  |  | 75,516 |  |  | 17,091 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Subsidiary income (in excess of) less than dividends distributed | (37,129 | ) |  | (1,040 | ) |  | 22,825 |
Loss on sale of investments | 3,248 |  |  | — |  |  | — |
Excess tax deficiencies from stock-based compensation | 223 |  |  | 8 |  |  | — |
Net change in other assets and other liabilities | 2,575 |  |  | 3,684 |  |  | 1,215 |
Net cash provided by operating activities | 64,561 |  |  | 78,168 |  |  | 41,131 |
Investing Activities |  |  |  |  |
Proceeds from sales, maturities and prepayments of securities available-for-sale | 26,561 |  |  | 787 |  |  | 1,376 |
Changes in investment securities and other stock - intercompany | (946 | ) |  | (19,183 | ) |  | — |
Equity contribution to subsidiaries | (11,336 | ) |  | (28,500 | ) |  | (1,110 | )
Net addition of premises and equipment | (603 | ) |  | (2,927 | ) |  | (1,920 | )
Net cash provided by (used in) investing activities | 13,676 |  |  | (49,823 | ) |  | (1,654 | )
Financing Activities |  |  |  |  |
Net increase in other borrowed funds | 144 |  |  | 143 |  |  | 143 |
Cash dividends paid | (44,232 | ) |  | (47,472 | ) |  | (37,395 | )
Excess tax deficiencies from stock-based compensation | (223 | ) |  | (8 | ) |  | — |
Proceeds from stock options exercised | 4,326 |  |  | 81 |  |  | — |
Net cash used in financing activities | (39,985 | ) |  | (47,256 | ) |  | (37,252 | )
Net increase (decrease) in cash and cash equivalents | 38,252 |  |  | (18,911 | ) |  | 2,225 |
Cash and cash equivalents at beginning of year | 12,427 |  |  | 31,338 |  |  | 29,113 |
Cash and cash equivalents at end of year | $ | 50,679 |  |  | 12,427 |  |  | 31,338 |

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