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Loans and Allowance for Loan Losses (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Loans and Allowance for Loan Losses (Textual) [Abstract]            
Loans carrying value pledged as collateral $ 452,000,000   $ 452,000,000      
Total Impaired loans 42,200,000   42,200,000     53,620,000
Interest income recognized on impaired loans accrual status 69,000 86,000 241,000 191,000    
Borrowers delinquent once payments     30 days      
Period for payment of principal or interest     90 days      
Loans classified as troubled debt restructurings 21,711,000   21,711,000     32,165,000
Troubled debt restructurings on non-accrual status 13,744,000   13,744,000     24,948,000
Troubled debt restructurings on accrual status 7,967,000   7,967,000     7,217,000
Reserves allocated to allowance for loan losses 1,576,000   1,576,000     1,522,000
Borrower's payment according to the modified terms     90 days      
Contractual interest due on non-accrual loans 966,000 1,751,000 966,000 1,751,000 1,110,000  
Interest income recognized on loans in non-accrual status $ 69,000 $ 86,000 $ 241,000 $ 191,000