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Allowance for Credit Losses - Troubled Debt Restructurings (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]          
Carrying amount, net of allowance of $0 $ 2,489,000   $ 2,489,000   $ 0
Troubled debt restructurings included in impaired and nonaccrual loans 10,766,000 17,036,000 10,766,000 17,036,000  
Reserves specific to modified loans 865,000   865,000    
Defaults on troubled debt restructurings 0 0 0 0  
Increase in allowance related to TDR's with subsequent defaults     6,000 427,000  
Loans and Leases Receivable, Impaired, Commitment to Lend 0   0    
Real Estate Portfolio Segment | Owner occupied
          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Numer of Contracts Modified During Period       2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment of Loans Modified During Period       500,000  
Financing Receivable, Modifications, Amount of Principal Modifications Made During Period       0  
Financing Receivable, Modifications, Post-Modification Recorded Investment of Loans Modified During Period       500,000  
Financing Receivable, Modifications, Outstanding Recorded Investment of Loans Modified During Period       $ 493,000