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Loans, Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Troubled debt restructurings that subsequently defaulted within 12 months of the restructuring date $ 0 $ 0  
Financing Receivable, Modifications, with No Related Allowance, Recorded Investment 312,000 0  
Financing Receivable, Modifications, with Related Allowance, Recorded Investment 0 $ 0  
Mortgage loans secured by residential real estate that were in the process of foreclosure 197,000    
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 $ 89,049,000   $ 97,685,000
Commercial and industrial [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Maturity Period 1 year    
Commercial and industrial [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Maturity Period 10 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 85.00%    
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