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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value          
Transfer between level 1 and level 2 $ 0 $ 0 $ 0 $ 0  
Transfer between level 2 and level 1 0 0 0 0  
Transfer into level 3 0 0 0 0  
Transfer out of level 3 0 $ 0 0 $ 0  
Recurring Basis | Federal agency mortgage-backed securities | Available-for-sale Securities          
Fair Value          
Securities available-for-sale, at fair value 9,992,000   9,992,000   $ 12,008,000
Recurring Basis | Federal agency debt | Available-for-sale Securities          
Fair Value          
Securities available-for-sale, at fair value 5,251,000   5,251,000   5,486,000
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt | Available-for-sale Securities          
Fair Value          
Securities available-for-sale, at fair value 1,972,000   1,972,000   1,976,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities | Available-for-sale Securities          
Fair Value          
Securities available-for-sale, at fair value 9,992,000   9,992,000   12,008,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt | Available-for-sale Securities          
Fair Value          
Securities available-for-sale, at fair value $ 3,279,000   $ 3,279,000   $ 3,510,000