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Consolidated Statements of Condition (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Held-to-maturity Securities, Fair Value $ 81,921,000 $ 62,431,000
Perferred Stock, Liquidation Value Per Share $ 1,000 $ 1,000
Preferred Stock, Shares Authorized 5,000,000 5,000,000
Preferred Stock, Liquidation Preference, Value $ 11,250 $ 11,250
Common Stock, No Par Value      
Common Stock, Shares Authorized 25,000,000 25,000,000
Common Stock, Shares, Issued 18,477,412 18,477,412
Common Stock, Shares, Outstanding 16,348,915 16,347,915
Treasury Stock, Shares 2,128,497 2,129,497
Series B Preferred Stock [Member]
    
Preferred Stock, Shares Issued 11,250 11,250
Preferred Stock, Shares Outstanding 11,250 11,250