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Investment Securities - Securities Carried at Cost (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Visa Inc. Class B common stock
Dec. 31, 2011
Visa Inc. Class B common stock
Dec. 31, 2012
Other assets
Dec. 31, 2011
Other assets
Feb. 20, 2013
Subsequent Event
Schedule of Cost-method Investments [Line Items]            
Federal Home Loan Bank stock, par value $ 100          
Federal Home Loan Bank stock       $ 6,000,000 $ 5,400,000  
Federal Home Loan Bank, dividend rate percentage           0.50%
Number of shares of securities carried at cost   16,939        
Carrying value of securities carried at cost 0          
Fair value of Class B common stock   $ 1,100,000 $ 732,000      
Conversion ratio for common stock 0.4206