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Fair Value - Fair Value on Recurring Basis - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Estimated fair value $ 53,102 $ 64,275
Percentage of portfolio in residential mortgage backed securities 42.00%  
Residential mortgage backed securities guaranteed by Government National Mortgage Association or Federal National Mortgage Association or Federal Home Loan Mortgage Corporation $ 22,100  
Equity securities 1,786 2,289
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Estimated fair value $ 22,373 $ 27,964