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Allowance for Credit Losses - Troubled Debt Restructurings (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Modifications [Line Items]        
Troubled debt restructurings included in impaired and nonaccrual loans $ 15,260,000 $ 17,210,000 $ 15,260,000 $ 17,210,000
Reserves specific to modified loans 836,000   836,000  
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   2
Financing Receivable, Modifications, Pre-Modification Recorded Investment of Loans Modified During Period   500,000   500,000
Financing Receivable, Modifications, Amount of Principal Modifications Made During Period   0   0
Financing Receivable, Modifications, Post-Modification Recorded Investment of Loans Modified During Period   500,000   500,000
Financing Receivable, Modifications, Outstanding Recorded Investment of Loans Modified During Period   $ 500,000   $ 500,000