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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
Mar. 31, 2013
loan
Mar. 31, 2012
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 7 14
Pre-Modification Outstanding Recorded Investment $ 2,948 $ 3,007
Post-Modification Outstanding Recorded Investment 2,959 2,973
Specific Reserves 40 16
Commercial Real Estate Portfolio Segment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 2 7
Pre-Modification Outstanding Recorded Investment 1,897 2,438
Post-Modification Outstanding Recorded Investment 1,897 2,404
Specific Reserves 0 0
Commercial Construction [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 0 0
Pre-Modification Outstanding Recorded Investment 0 0
Post-Modification Outstanding Recorded Investment 0 0
Specific Reserves 0 0
Commercial Other [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 3 3
Pre-Modification Outstanding Recorded Investment 536 12
Post-Modification Outstanding Recorded Investment 546 12
Specific Reserves 40 0
Municipal [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 0 0
Pre-Modification Outstanding Recorded Investment 0 0
Post-Modification Outstanding Recorded Investment 0 0
Specific Reserves 0 0
Residential Term [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 1 4
Pre-Modification Outstanding Recorded Investment 312 557
Post-Modification Outstanding Recorded Investment 312 557
Specific Reserves 0 16
Home Equity [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans 1 0
Pre-Modification Outstanding Recorded Investment 203 0
Post-Modification Outstanding Recorded Investment 204 0
Specific Reserves $ 0 $ 0