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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Loan
Sep. 30, 2012
Loan
Sep. 30, 2013
Loan
Sep. 30, 2012
Loan
Dec. 31, 2012
Loan
Financing Receivable, Modifications [Line Items]          
Number of Loans 10 4 59 26 39
Term Modification $ 1,008 $ 45 $ 11,616 $ 4,864 $ 7,398
Rate Modification 0 391 0 391 391
Combination 60 666 152 882 893
Post-Modification Outstanding Balance 1,068 1,102 11,768 6,137 8,682
Defaulted restructured loans, number of loans 3 3 8 6  
Defaulted Restructured loans, recorded investment 242 410 2,272 415  
Commercial Construction [Member]
          
Financing Receivable, Modifications [Line Items]          
Number of Loans     6 5 5
Term Modification     2,603 557 557
Rate Modification     0 0 0
Combination     0 0 0
Post-Modification Outstanding Balance     2,603 557 557
Defaulted restructured loans, number of loans 0 0 0 0  
Defaulted Restructured loans, recorded investment 0 0 0 0  
Commercial Secured by Real Estate [Member]
          
Financing Receivable, Modifications [Line Items]          
Number of Loans 3 2 23 8 11
Term Modification 905 0 2,172 3,196 3,624
Rate Modification 0 0 0 0 0
Combination 0 666 0 882 882
Post-Modification Outstanding Balance 905 666 2,172 4,078 4,506
Defaulted restructured loans, number of loans 1 1 1 1  
Defaulted Restructured loans, recorded investment 69 344 69 344  
Commercial Other [Member]
          
Financing Receivable, Modifications [Line Items]          
Number of Loans 7 1 29 12 22
Term Modification 103 45 6,468 1,111 3,217
Rate Modification 0 0 0 0 0
Combination 60 0 152 0 11
Post-Modification Outstanding Balance 163 45 6,620 1,111 3,228
Defaulted restructured loans, number of loans 2 2 7 5  
Defaulted Restructured loans, recorded investment 173 66 2,202 71  
Real Estate Mortgage [Member]
          
Financing Receivable, Modifications [Line Items]          
Number of Loans   1 1 1 1
Term Modification   0 373 0 0
Rate Modification   391 0 391 391
Combination   0 0 0 0
Post-Modification Outstanding Balance   $ 391 $ 373 $ 391 $ 391