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Allowance for Loan Losses TDR's by Class and Specific Reserve (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
loan
Dec. 31, 2012
loan
Mar. 31, 2012
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 106 101 71
Balance $ 31,147 $ 29,955 $ 20,647
Specific Reserves 2,590 2,590 606
Commercial Real Estate Portfolio Segment [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 20 18 12
Balance 13,715 11,961 7,610
Specific Reserves 313 823 271
Commercial Construction [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 3 3 1
Balance 2,317 3,319 1,148
Specific Reserves 1,194 969 0
Commercial Other [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 24 23 12
Balance 3,063 3,074 1,919
Specific Reserves 40 574 85
Residential Term [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 54 53 46
Balance 11,195 10,945 9,970
Specific Reserves 1,034 224 250
Home Equity [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 5 4 0
Balance 857 656 0
Specific Reserves $ 9 $ 0 $ 0