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Loans and Allowance for Loan Losses (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Securities
Loans
Mar. 31, 2012
Loans
Dec. 31, 2012
Loans and Allowance for Loan Losses (Textual) [Abstract]      
Nonaccrual consumer loans outstanding $ 795,793,000   $ 807,795,000
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loans carrying value pledged as collateral 422,524,000    
Individually evaluated for impairment 4,092,000   4,020,000
Impaired loans 38,622,000   39,363,000
Individually evaluated for impairment 38,463,000   39,189,000
Impaired loans with no related allocation 12,892,000   14,733,000
Percentage of impaired loans with no related allocation 33.00%   37.00%
Interest income recognized on impaired loans accrual status 108,000 100,000  
Contractual interest due on loans in non-accrual basis 350,000 626,000  
Interest income recognized on loans in non-accrual basis 108,000 100,000  
Borrowers delinquent once payments 30 days    
Period for payment of principal or interest 90 days    
Loans classified as troubled debt restructurings 22,314,000   22,363,000
Troubled debt restructurings on non-accrual status 14,341,000   14,081,000
Troubled debt restructurings on accrual status 7,973,000   8,282,000
Reserves allocated to allowance for loan losses 1,718,000   1,544,000
Borrower's payment according to the modified terms 90 days    
Loans meeting the TDR criteria 1    
Number of defaulted loans modified as a TDR 0 0  
Consumer [Member]
      
Loans and Allowance for Loan Losses (Textual) [Abstract]      
Nonaccrual consumer loans outstanding $ 159,000 $ 174,000