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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2010 | Dec. 31, 2009
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Consolidated Balance Sheets [Abstract] |  |
Amortized cost of securities available-for-sale | $ 1,274,258 | $ 1,241,381
Fair value of securities held-to-maturity | $ 686,114 | $ 523,450
Preferred stock shares authorized | 200,000 | 200,000
Preferred stock shares issued | 100,000 | 100,000
Preferred stock per share liquidation preference | $ 1,000 | $ 1,000
Common stock par value | $ 0 | $ 0
Common stock shares authorized | 20,000,000 | 20,000,000
Common stock shares issued | 16,151,062 | 16,151,112
Treasury stock shares | 752,128 | 1,268,332

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