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Loans, Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Troubled debt restructurings that subsequently defaulted within 12 months of the restructuring date $ 0 $ 1,236,000  
Impaired loans modified without a valuation allowance 0 23,000  
Impaired loans modified with a valuation allowance 0 $ 0  
Mortgage loans secured by residential real estate that were in the process of foreclosure 335,000    
Federal Home Loan Mortgage Corporation and Other Investors [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance of loans serviced for others $ 90,630,000   $ 92,818,000
Commercial and industrial [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 1 month    
Commercial and industrial [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 5 years    
Commercial, secured by real estate [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 1 year    
Amortization period 5 years    
Balloon payments period 1 year    
Loan to appraised value ratio 75.00%    
Commercial, secured by real estate [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 10 years    
Amortization period 25 years    
Balloon payments period 10 years    
Loan to appraised value ratio 80.00%    
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Home equity line of credit draw period 5 years    
Residential real estate [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 1 year    
Amortization period 5 years    
Loan to appraised value ratio 80.00%    
Residential real estate [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Adjustable rate period 10 years    
Amortization period 30 years    
Consumer [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amortization period 72 months