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Consolidated Statements of Changes in Stockholders' Equity (USD $) | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interest [Member] | Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 243,967,000 | $ 677,000 | $ 634,623,000 | $ (875,000) | $ 551,588,000 | $ (125,736,000) | $ 8,500,000 | $ 1,312,744,000 |
Balance (in Shares) at Dec. 31, 2009 | 258,000 | 63,459,590 |  |  |  |  |  |  |
Common stock issuance |  | 150,000 | 124,778,000 |  |  |  |  | 124,928,000 |
Common stock issuance (in Shares) |  | 15,028,409 |  |  |  |  |  |  | 15,028,409
Dividend Reinvestment Plan |  |  | 310,000 |  |  |  |  | 310,000 | 310,000
Dividend Reinvestment Plan (in Shares) |  | 28,778 |  |  |  |  |  |  | 28,778
Restricted stock units vested (in Shares) |  | 15,006 |  |  |  |  |  |  |
Tax short-fall from stock options |  |  | (539,000) |  |  |  |  | (539,000) |
Stock -based compensation |  |  | 3,337,000 |  |  |  |  | 3,337,000 | 3,337,000
Cash dividends of $0.04/$0.04/$0.04 per share |  |  |  |  | (3,140,000) |  |  | (3,140,000) |
Discount accretion and other adjustment on preferred stock | 3,488,000 |  |  |  | (3,488,000) |  |  |  |
Dividends on preferred stock |  |  |  |  | (12,900,000) |  | (610,000) | (13,510,000) | 16,388,000
Redemption of noncontrolling interest |  |  |  |  |  |  | (53,000) | (53,000) |
Change in other comprehensive loss |  |  |  | (147,000) |  |  |  | (147,000) |
Net income |  |  |  |  | 11,565,000 |  | 610,000 | 12,175,000 | 11,565,000
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 short-fall from stock options |  |  | (218,000) |  |  |  |  | (218,000) |
Stock -based compensation |  |  | 1,758,000 |  |  |  |  | 1,758,000 | 1,758,000
Cash dividends of $0.04/$0.04/$0.04 per share |  |  |  |  | (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 | 1,507,186,000
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 benefits from stock options |  |  | (620,000) |  |  |  |  | (620,000) |
Stock -based compensation |  |  | 2,062,000 |  |  |  |  | 2,062,000 | 2,062,000
Cash dividends of $0.04/$0.04/$0.04 per share |  |  |  |  | (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 |  |  |  |  |  |  |

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