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Investment Securities (Details Textual) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Investment Securities (Additional Textual) [Abstract]            
Proceeds from the sale of securities available for sale $ 3,600,000   $ 0 $ 3,584,000 $ 42,447,000  
Net gains (162,000)   0 (162,000) 1,600,000  
Federal Reserve Bank Stock 712,000     712,000    
Investment securities pledged 224,736,000 201,207,000   224,736,000   201,207,000
Discount rate       0.00%   11.00%
Voluntary Prepayments       0.00%   16.20%
Conditional Default Rates       0.00%   16.20%
Conditional Default Rates downward after 12 months           9.30%
Conditional Default Rates For 17 yrs after trending downward       0.00%   0.00%
Loss Severity       0.00%   55.50%
Loss Severity related to linear fashion            23.00%
Loss Severity related to per year            2.50%
Duration period of 16.2% Conditional Default Rates    24 months        24 months
Duration period of 9.3% Conditional Default Rates    12 months        12 months
Duration period of zero Conditional Default Rates    17 years        17 years
Written Down Due to Other Than Temporary Impairment Evident   1,100,000       1,100,000
Federal Home Loan Bank [Member]
           
Investment Securities (Textual) [Abstract]            
Federal Home Loan Bank Stock $ 1,585,000     $ 1,585,000    
Number of shares owned 15,851     15,851