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Allowance for Loan Losses TDR's by Class and Specific Reserve (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
loan
Dec. 31, 2012
loan
Jun. 30, 2012
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 105 101 82
Balance $ 30,874 $ 29,955 $ 24,980
Specific Reserves 1,916 2,590 2,109
Commercial Real Estate Portfolio Segment [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 20 18 17
Balance 13,593 11,961 9,216
Specific Reserves 868 823 496
Commercial Construction [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 3 3 2
Balance 1,789 3,319 3,099
Specific Reserves 267 969 696
Commercial Other [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 23 23 15
Balance 3,491 3,074 1,984
Specific Reserves 607 574 590
Residential Term [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 54 53 48
Balance 11,149 10,945 10,681
Specific Reserves 167 224 327
Home Equity [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 5 4 0
Balance 852 656 0
Specific Reserves $ 7 $ 0 $ 0