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Consolidated Statements of Changes in Stockholders' Equity (USD $) | Preferred Stock [Member] Series B Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] Series B Preferred Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interest [Member] | Parent [Member] Series B Preferred Stock [Member] | Parent [Member] | Series B Preferred Stock [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 |  | $ 247,455,000 | $ 827,000 |  | $ 762,509,000 | $ (1,022,000) | $ 543,625,000 | $ (125,736,000) | $ 8,447,000 |  | $ 1,436,105,000 |  |
Balance (in Shares) at Dec. 31, 2010 |  | 258,000 | 78,531,783 |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  | 1,000 |  | 286,000 |  |  |  |  |  | 287,000 |  | 287,000
Dividend Reinvestment Plan (in Shares) |  |  | 21,281 |  |  |  |  |  |  |  |  |  | 21,281
Restricted stock units vested (in Shares) |  |  | 12,633 |  |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | 1,000 |  | 1,306,000 |  |  |  |  |  | 1,307,000 |  |
Stock options exercised (in Shares) |  |  | 86,860 |  |  |  |  |  |  |  |  |  | 86,860
Tax effect from stock options |  |  |  |  | (218,000) |  |  |  |  |  | (218,000) |  |
Stock -based compensation |  |  |  |  | 1,758,000 |  |  |  |  |  | 1,758,000 |  | 1,758,000
Cash dividends |  |  |  |  |  |  | (3,146,000) |  |  |  | (3,146,000) |  |
Discount accretion and other adjustment on preferred stock |  | 3,537,000 |  |  |  |  | (3,537,000) |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  | (12,900,000) |  | (605,000) |  | (13,505,000) |  | 16,437,000
Change in other comprehensive loss |  |  |  |  |  | (7,710,000) |  |  |  |  | (7,710,000) |  |
Net income |  |  |  |  |  |  | 100,150,000 |  | 605,000 |  | 100,755,000 |  | 100,150,000
Balance at Dec. 31, 2011 |  | 250,992,000 | 829,000 |  | 765,641,000 | (8,732,000) | 624,192,000 | (125,736,000) | 8,447,000 |  | 1,515,633,000 |  |
Balance (in Shares) at Dec. 31, 2011 |  | 258,000 | 78,652,557 |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  | 291,000 |  |  |  |  |  | 291,000 |  | 291,000
Dividend Reinvestment Plan (in Shares) |  |  | 17,956 |  |  |  |  |  |  |  |  |  | 17,956
Restricted stock units vested (in Shares) |  |  | 11,814 |  |  |  |  |  |  |  |  |  |
Stock salary |  |  |  |  | 788,000 |  |  |  |  |  | 788,000 |  |
Stock salary (in Shares) |  |  | 45,937 |  |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | 1,000 |  | 763,000 |  |  |  |  |  | 764,000 |  |
Stock options exercised (in Shares) |  |  | 50,024 |  |  |  |  |  |  |  |  |  | 50,024
Tax effect from stock options |  |  |  |  | (620,000) |  |  |  |  |  | (620,000) |  |
Stock -based compensation |  |  |  |  | 2,062,000 |  |  |  |  |  | 2,062,000 |  | 2,850,000
Cash dividends |  |  |  |  |  |  | (3,149,000) |  |  |  | (3,149,000) |  |
Discount accretion and other adjustment on preferred stock |  | 3,588,000 |  |  |  |  | (3,588,000) |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  | (12,900,000) |  | (605,000) |  | (13,505,000) |  | 16,488,000
Change in other comprehensive loss |  |  |  |  |  | 9,197,000 |  |  |  |  | 9,197,000 |  |
Net income |  |  |  |  |  |  | 117,438,000 |  | 605,000 |  | 118,043,000 |  | 117,438,000
Balance at Dec. 31, 2012 |  | 254,580,000 | 830,000 |  | 768,925,000 | 465,000 | 721,993,000 | (125,736,000) | 8,447,000 |  | 1,629,504,000 |  | 1,621,057,000
Balance (in Shares) at Dec. 31, 2012 |  | 258,000 | 78,778,288 |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  | 605,000 |  |  |  |  |  | 605,000 |  | 605,000
Dividend Reinvestment Plan (in Shares) |  |  | 25,984 |  |  |  |  |  |  |  |  |  | 25,984
Redemption of Series B Preferred Stock | (258,000,000) |  |  | (302,000) |  |  |  |  |  | (258,302,000) |  | (258,000,000) |
Redemption of Series B Preferred Stock (in Shares) | (258,000) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of noncontrolling interest |  |  |  |  | (191,000) |  |  |  | (8,447,000) |  | (8,638,000) |  |
Restricted stock units vested (in Shares) |  |  | 138,220 |  |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |
Stock salary |  |  | 1,000 |  | 1,106,000 |  |  |  |  |  | 1,107,000 |  |
Stock salary (in Shares) |  |  | 52,431 |  |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | 6,000 |  | 14,749,000 |  |  |  |  |  | 14,755,000 |  |
Stock options exercised (in Shares) |  |  | 594,946 |  |  |  |  |  |  |  |  |  | 594,946
Tax effect from stock options |  |  |  |  | (2,509,000) |  |  |  |  |  | (2,509,000) |  |
Stock -based compensation |  |  |  |  | 2,106,000 |  |  |  |  |  | 2,106,000 |  | 3,213,000
Cash dividends |  |  |  |  |  |  | (6,342,000) |  |  |  | (6,342,000) |  |
Discount accretion and other adjustment on preferred stock |  | 3,420,000 |  |  |  |  | (3,420,000) |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  | (6,265,000) |  | (592,000) |  | (6,857,000) |  | 9,685,000
Change in other comprehensive loss |  |  |  |  |  | (30,194,000) |  |  |  |  | (30,194,000) |  |
Net income |  |  |  |  |  |  | 123,143,000 |  | 592,000 |  | 123,735,000 |  | 123,143,000
Balance at Dec. 31, 2013 |  |  | $ 838,000 |  | $ 784,489,000 | $ (29,729,000) | $ 829,109,000 | $ (125,736,000) |  |  | $ 1,458,971,000 |  | $ 1,458,971,000
Balance (in Shares) at Dec. 31, 2013 |  |  | 79,589,869 |  |  |  |  |  |  |  |  |  |

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