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Summary of Significant Accounting Policies - Cash Flows, Allowance for Loan Losses and Mortgage Banking Activities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Office
Dec. 31, 2018
USD ($)
Presentation of Cash Flows    
Cash balances $ 1,100  
Allowance for Loan Losses    
Cumulative days past due for charge off for retail consumer loans 120 days  
Mortgage Banking Activities and Mortgage Loans Held for Sale    
Number of mortgage loan production offices | Office 9  
Other real estate owned    
Other real estate owned $ 120 $ 0
Minimum    
Mortgage Banking Activities and Mortgage Loans Held for Sale    
Loan commitment to sale duration 30 days  
Maximum    
Mortgage Banking Activities and Mortgage Loans Held for Sale    
Loan commitment to sale duration 120 days