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Fair Value Measurements - Summary of difference between aggregate fair value and aggregate unpaid principal balance (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Residential mortgage backed securities    
Fair Value $ 60,036 $ 52,927
Aggregate Unpaid Principal Balance 58,970 52,054
Difference 1,066 873
Loans 90 or more days past due 0 0
Loans in nonaccrual status $ 0 0
FHA Mortgage Backed Securities    
Fair Value   3,780
Aggregate Unpaid Principal Balance   $ 3,780