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Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
loans
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
loans
Sep. 30, 2015
USD ($)
loans
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of loans removed from TDR designation | loans       0 4  
Loans removed from TDR designation, recorded investment         $ 1,400,000  
Recorded investment in Troubled Debt Restructurings   $ 19,188,000   $ 19,188,000   $ 19,081,000
TDR loans accruing interest as of period end   19,100,000   19,100,000   19,000,000
TDR loans acquired   0   0   137,000
Number of loans transferred to loans held-for-sale | loans 1          
Charge-off on loan transferred to held-for-sale   0 $ 3,000 13,000 856,000  
Gain (loss) on transfer of loans to held-for-sale $ 0          
Commercial loans | Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   2,964,000   2,964,000   4,698,000
Charge-off on loan transferred to held-for-sale   0 2,000 9,000 5,000  
Commercial real estate loans | Commercial real estate, owner-occupied            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   6,993,000   6,993,000   6,993,000
Charge-off on loan transferred to held-for-sale   0 0 0 0  
Commercial real estate loans | Commercial real estate, investor            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   2,299,000   2,299,000   514,000
Charge-off on loan transferred to held-for-sale   0 0 0 0  
Commercial real estate loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   3,238,000   3,238,000   3,238,000
Loans reclassified to held-for-sale 1,500,000          
Charge-off on loan transferred to held-for-sale $ 839,000 0 0 0 839,000  
Residential loans | Home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   696,000   696,000   460,000
Charge-off on loan transferred to held-for-sale   0 0 0 0  
Residential loans | Other residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   1,974,000   1,974,000   2,010,000
Charge-off on loan transferred to held-for-sale   0 0 0 0  
Consumer loans | Installment and other consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   1,024,000   1,024,000   $ 1,168,000
Charge-off on loan transferred to held-for-sale   $ 0 $ 1,000 $ 4,000 $ 12,000