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Fair Value - Fair Value on a Recurring Basis (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 64,275 $ 46,713
Percentage of portfolio in residential mortgage backed securities 44.00%  
Residential mortgage backed securities guaranteed by Government National Mortgage Association or Federal National Mortgage Association or Federal Home Loan Mortgage Corporation $ 28,000  
Estimated fair value 2,289 2,144
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 27,964 $ 26,613