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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Pending Completion    
Transfer between level 1 and level 2 $ 0 $ 0
Transfer between level 2 and level 1 0 0
Transfer into level 3 0 0
Transfer out of level 3 0 0
Recurring Basis | Federal agency mortgage-backed securities    
Fair Value Pending Completion    
Securities available-for-sale, at fair value 7,956 9,508
Recurring Basis | Federal agency debt    
Fair Value Pending Completion    
Securities available-for-sale, at fair value 3,050 5,214
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt    
Fair Value Pending Completion    
Securities available-for-sale, at fair value   1,979
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities    
Fair Value Pending Completion    
Securities available-for-sale, at fair value 7,956 9,508
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt    
Fair Value Pending Completion    
Securities available-for-sale, at fair value $ 3,050 $ 3,235