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Loans and Allowance for Loan Losses - Narrative (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
loan
segment
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loan portfolio segments | segment 5    
Number of contracts | loan 0    
Number of contracts, subsequent payment default | loan 0    
Other real estate owned | $ $ 1,561,000   $ 2,495,000
Trouble Debt Restructuring [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans that met criteria for restructured | $ $ 61,000   $ 116,000
Number of contracts, nonaccrual | loan 0    
Commercial Real Estate [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans that met criteria for restructured | $   $ 622,000  
Number of contracts | loan   1  
Consumer Real Estate [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans that met criteria for restructured | $   $ 34,000  
Number of contracts | loan   1  
Residential Real Estate [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Other real estate owned | $ $ 0