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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), net [Member] | Treasury Stock [Member] | Unearned ESOP Shares [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2010 | $ 749,777 | $ 105,515 | $ 366,488 | $ 291,492 | $ (2,458) | $ (7,660) | $ (3,600)
Beginning balance, shares at Dec. 31, 2010 |  | 104,846,194 |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Net income | 20,991 |  |  | 20,991 |  |  |
Other comprehensive income | 6,371 |  |  |  | 6,371 |  |
Cash dividends declared | (9,418) |  |  | (9,418) |  |  |
Net decrease in unearned ESOP shares | 1,500 |  |  |  |  |  | 1,500
ESOP market value adjustment | (495) |  | (495) |  |  |  |
Discount on dividend reinvestment plan purchases | (48) |  | (48) |  |  |  |
Tax benefit of stock options exercised | 6 |  | 6 |  |  |  |
Treasury stock acquired | (9) |  |  |  |  | (9) |
Treasury stock acquired, shares |  | (1,336) |  |  |  |  |
Treasury stock reissued | 72 |  |  | (83) |  | 155 |
Treasury stock reissued, shares |  | 13,760 |  |  |  |  |
Restricted stock | 101 | 25 | (2) | 0 |  | 78 |
Restricted stock, shares |  | 25,000 |  |  |  |  |
Common stock issuance | 144 | 23 | 121 |  |  | 0 |
Common stock issuance, shares |  | 23,376 |  |  |  |  |
Ending balance at Sep. 30, 2011 | 768,992 | 105,563 | 366,070 | 302,982 | 3,913 | (7,436) | (2,100)
Ending balance, shares at Sep. 30, 2011 |  | 104,906,994 |  |  |  |  |
Beginning balance at Dec. 31, 2011 | 758,543 | 105,563 | 365,868 | 294,056 | 2,001 | (7,345) | (1,600)
Beginning balance, shares at Dec. 31, 2011 | 104,916,994 | 104,916,994 |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |
Net income | 33,219 |  |  | 33,219 |  |  |
Other comprehensive income | 2,966 |  |  |  | 2,966 |  |
Cash dividends declared | (13,633) |  |  | (13,633) |  |  |
Net decrease in unearned ESOP shares | 1,500 |  |  |  |  |  | 1,500
ESOP market value adjustment | (445) |  | (445) |  |  |  |
Discount on dividend reinvestment plan purchases | (67) |  | (67) |  |  |  |
Tax benefit of stock options exercised | 1 |  | 1 |  |  |  |
Treasury stock acquired | (9,112) |  |  |  |  | (9,112) |
Treasury stock acquired, shares |  | (1,342,517) |  |  |  |  |
Treasury stock reissued | 617 |  | 0 | (329) |  | 946 |
Treasury stock reissued, shares |  | 95,552 |  |  |  |  |
Restricted stock | 302 |  | 37 | (1,264) |  | 1,529 |
Restricted stock, shares |  | 220,000 |  |  |  |  |
Ending balance at Sep. 30, 2012 | $ 773,891 | $ 105,563 | $ 365,394 | $ 312,049 | $ 4,967 | $ (13,982) | $ (100)
Ending balance, shares at Sep. 30, 2012 | 103,890,029 | 103,890,029 |  |  |  |  |

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