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Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans removed from TDR resignation | loan 0 0 5
Recorded investment of loans removed from TDR resignation     $ 1,600,000
Recorded investment in Troubled Debt Restructurings $ 16,520,000 $ 18,168,000  
TDR loans accruing interest as of period end 0    
Acquired loans included in TDR 0    
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 2,165,000 2,207,000  
Commercial real estate | Commercial real estate, owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 6,999,000 6,993,000  
Commercial real estate | Commercial real estate, investor      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 2,171,000 2,256,000  
Commercial real estate | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 2,969,000 3,245,000  
Residential loans | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 347,000 625,000  
Residential loans | Other residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings 1,148,000 1,965,000  
Consumer loans | Installment and other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded investment in Troubled Debt Restructurings $ 721,000 $ 877,000