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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 12 Months Ended
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
loans
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of loans removed from TDR designation | loans       4    
Loans removed from TDR designation, recorded investment       $ 1,400,000   $ 0
Recorded investment in Troubled Debt Restructurings   $ 18,912,000   18,912,000   22,703,000
TDR loans accruing interest as of period end   18,800,000   18,800,000   15,900,000
TDR loans acquired   147,000   147,000   1,800,000
Charge-off to allowance for loan losses   3,000 $ 2,000 856,000 $ 276,000  
Commercial loans | Commercial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   4,098,000   4,098,000   3,584,000
Charge-off to allowance for loan losses   2,000 0 5,000 66,000  
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   8,459,000
Charge-off to allowance for loan losses   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   733,000   733,000   524,000
Charge-off to allowance for loan losses   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   5,684,000
Loan value transferred to held-for-sale $ 1,500,000          
Charge-off to allowance for loan losses $ 839,000 0 0 839,000 204,000  
Residential loans | Home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   463,000   463,000   694,000
Charge-off to allowance for loan losses   0 0 0 0  
Residential loans | Other residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   2,020,000   2,020,000   2,045,000
Charge-off to allowance for loan losses   0 0 0 0  
Consumer loans | Installment and other consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recorded investment in Troubled Debt Restructurings   1,367,000   1,367,000   $ 1,713,000
Charge-off to allowance for loan losses   $ 1,000 $ 2,000 $ 12,000 $ 6,000