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U.S.Treasury Capital Purchase Program Participation (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2009 | May 15, 2009 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
U.S. Treasury Capital Purchase Program Participation (Textual) [Abstract] |  |  |  |  |  |  |
Repurchase price of warrant |  |  |  |  | $ 7,465,000 | $ 0 | $ 0
U.S. Treasury Capital Purchase Program Participation (Additional Textual) [Abstract] |  |  |  |  |  |  |
Sale of preferred stock and a warrant for common stock | 21,000,000 |  |  |  |  |  |
Number of cumulative perpetual preferred stock shares |  | 21,000 |  |  |  |  |
Liquidation value of cumulative perpetual preferred stock |  | $ 1,000 |  |  |  |  |
Number of common stock shares available to U.S. Treasury under warrant issued |  | 616,438 |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |
Rate of cumulative dividends for the first five years | 5.00% |  |  |  |  |  |
Rate of cumulative dividends for the remaining period | 9.00% |  |  |  |  |  |
Period of common stock warrant | 10 years |  |  |  |  |  |
Exercise price of common stock warrant |  | 5.11 |  |  |  |  |
Discount rate |  | 12.00% |  |  |  |  |
Estimated fair value |  | 15,500,000 |  |  |  |  |
Fair value of common stock warrant |  | 900,000 |  |  |  |  |
Aggregate fair value for preferred stock and the common stock warrant |  | 16,400,000 |  |  |  |  |
Aggregate attributable to the preferred stock |  | 94.60% |  |  |  |  |
Aggregate attributable to the common stock warrants |  | 5.40% |  |  |  |  |
Issuance amount allocated to preferred stock |  | 19,900,000 |  |  |  |  |
Issuance amount allocated to common stock warrant |  | 1,100,000 |  |  |  |  |
Discount on the preferred stock |  | 1,300,000 |  |  |  |  |
Period of reduction in net income available to common shareholders |  |  |  |  | 5 years |  |
Reduction from retained earnings resulting from accelerated discount on preferred Stock |  |  |  | 600,000 |  |  |
Amortization period for accelerated discount on preferred stock |  |  |  | 5 years |  |  |
Cash dividend paid by bank to parent company to fund the repurchase of the warrant |  |  | 7,500,000 |  | 774,000 |  | 85,000
Reduction in shareholders' equity resulting from repurchase of warrant |  |  | 7,500,000 |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |
U.S. Treasury Capital Purchase Program Participation (Textual) [Abstract] |  |  |  |  |  |  |
Direct cost associated with transaction |  | 200,000 |  |  |  |  |
Repurchase of Preferred Stock |  |  |  | 21,000,000 |  |  |
Stock warrant [Member] |  |  |  |  |  |  |
U.S. Treasury Capital Purchase Program Participation (Textual) [Abstract] |  |  |  |  |  |  |
Expected dividend yield |  | 1.00% |  |  |  |  |
Risk-free interest rate |  | 1.99% |  |  |  |  |
Expected life |  | 5 years |  |  |  |  |
Expected volatility |  | 53.00% |  |  |  |  |
Weighted average fair value |  | $ 3.92 |  |  |  |  |
Repurchase price of warrant |  |  | 7,500,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
U.S. Treasury Capital Purchase Program Participation (Textual) [Abstract] |  |  |  |  |  |  |
Reduction in net income attributable to common shareholders due to accretion of preferred stock discount |  | 300,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
U.S. Treasury Capital Purchase Program Participation (Textual) [Abstract] |  |  |  |  |  |  |
Reduction in net income attributable to common shareholders due to accretion of preferred stock discount |  | $ 200,000 |  |  |  |  |

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