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Allowance for Loan Losses (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Allowance for loan losses      
Impaired loans $ 37,420   $ 33,557
Increase in provision for decrease in FDIC indemnification asset 746 496  
Allocated amount of specific reserves to customers whose loan terms have been modified in troubled debt restructurings 3,100   1,600
Loans modified in troubled debt restructurings 73    
Allowance for Doubtful Accounts Receivable, Charge-offs 9    
Minimum outstanding balance of non-homogeneous loans to be individually evaluated as to credit risk 50    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   162  
Covered Loans
      
Allowance for loan losses      
Loans Past Due Over 90 Day Still Accruing 27   630
Nonaccrual 3,700   4,300
Impaired loans 2,600   2,900
Allowance for Loan Losses Allocated $ 99   $ 236