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ALLOWANCE FOR LOAN LOSSES: (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for loan losses      
Financing Receivable, Modifications, Recorded Investment $ 1,600 $ 1,600  
Impaired loans 33,557 32,626  
Allowance for Loan Losses Allocated 7,609 4,273  
Increase in provision for decrease in FDIC indemnification asset 2,200 125 1,700
Minimum outstanding balance of non-homogeneous loans to be individually evaluated as to credit risk 50    
Troubled Debt Restructurings Description Modifications involving a reduction of the stated interest rate of the loan were for periods ranging from twelve months to five years. Modifications involving an extension of the maturity date were for periods ranging from twelve months to 10 years.    
Commercial Loan [Member]
      
Allowance for loan losses      
Financing Receivable, Modifications, Recorded Investment 5,100 631  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 879    
Residential Loans [Member]
      
Allowance for loan losses      
Financing Receivable, Modifications, Recorded Investment 13 212  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 31    
Installment Loans [Member]
      
Allowance for loan losses      
Financing Receivable, Modifications, Recorded Investment 864    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 14    
Covered Loans
      
Allowance for loan losses      
Loans Past Due Over 90 Day Still Accruing 630 413  
Nonaccrual 4,300 5,600  
Impaired loans 2,900 5,000  
Allowance for Loan Losses Allocated $ 236 $ 1,000