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Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
loans
Dec. 31, 2015
USD ($)
loans
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of loans removed from TDR resignation | loans   5    
Recorded investment of loans removed from TDR resignation   $ 1,600,000 $ 0  
Recorded investment in Troubled Debt Restructurings   19,081,000 22,703,000  
TDR loans accruing interest as of period end   19,000,000 15,900,000  
Acquired loans included in TDR   137,000 1,800,000  
Number of loans transferred to loans held-for-sale | loans 1      
Charge-off on loan transferred to held-for-sale   864,000 277,000 $ 1,154,000
Gain (loss) on transfer of loans to held-for-sale $ 0      
Commercial | Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   4,698,000 3,584,000  
Charge-off on loan transferred to held-for-sale   5,000 66,000 672,000
Commercial real estate, owner-occupied | Commercial real estate loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   6,993,000 8,459,000  
Charge-off on loan transferred to held-for-sale   0 0 0
Commercial real estate, investor | Commercial real estate loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   514,000 524,000  
Charge-off on loan transferred to held-for-sale   0 0 156,000
Construction | Commercial real estate loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   3,238,000 5,684,000  
Loans reclassified to held-for-sale 1,500,000      
Charge-off on loan transferred to held-for-sale $ 839,000 839,000 204,000 62,000
Home equity | Residential loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   460,000 694,000  
Charge-off on loan transferred to held-for-sale   0 0 176,000
Other residential | Residential loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   2,010,000 2,045,000  
Charge-off on loan transferred to held-for-sale   0 0 0
Installment and other consumer | Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Recorded investment in Troubled Debt Restructurings   1,168,000 1,713,000  
Charge-off on loan transferred to held-for-sale   $ 20,000 $ 7,000 $ 88,000