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Allowance for Loan Losses TDR's by Class of Loan and the Associated Specific Reserve (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
loan
Sep. 30, 2012
loan
Sep. 30, 2013
loan
Sep. 30, 2012
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 3 11 10 38
Post-Modification Outstanding Recorded Investment $ 410 $ 4,512 $ 3,336 $ 12,369
Specific Reserves 0 46 0 1,501
Commercial Real Estate Portfolio Segment [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 0 2 2 13
Post-Modification Outstanding Recorded Investment 0 3,150 1,890 6,962
Specific Reserves 0 29 0 175
Commercial Construction [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 0 0 0 1
Post-Modification Outstanding Recorded Investment 0 0 0 1,951
Specific Reserves 0 0 0 696
Commercial Other [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 0 6 3 14
Post-Modification Outstanding Recorded Investment 0 682 523 1,369
Specific Reserves 0 2 0 546
Municipal [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 0 0 0 0
Post-Modification Outstanding Recorded Investment 0 0 0 0
Specific Reserves 0 0 0 0
Residential Term [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 2 2 3 9
Post-Modification Outstanding Recorded Investment 400 263 712 1,670
Specific Reserves 0 15 0 84
Home Equity [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 1 1 2 1
Post-Modification Outstanding Recorded Investment 10 417 211 417
Specific Reserves $ 0 $ 0 $ 0 $ 0