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Consolidated Condensed Balance Sheets (Parenthetical) (USD $) | Sep. 30, 2011 | Dec. 31, 2010
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Consolidated Condensed Balance Sheets [Abstract] |  |
Amortized cost of securities available-for-sale | $ 772,910,000 | $ 1,274,258,000
Fair value of securities held-to-maturity | 861,369,000 | 686,114,000
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 no par value |  |
Common stock shares authorized | 20,000,000 | 20,000,000
Common stock shares issued | 16,151,033 | 16,151,062
Treasury stock shares | 752,129 | 752,128

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