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Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Statement of Financial Position [Abstract] |  |
Securities available-for-sale, amortized cost | $ 1,013,114 | $ 801,147
Securities held-to-maturity, amortized cost | $ 565,599 | $ 834,574
Preferred stock, shares authorized | 200,000 | 200,000
Preferred stock, shares issued |  | 100,000
Preferred stock per share liquidation preference | $ 1 | $ 1
Common stock no par value |  |
Common stock shares authorized | 20,000,000 | 20,000,000
Common stock shares issued | 16,150,996 | 16,151,021
Treasury stock shares | 745,109 | 745,109

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