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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
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 | Residential mortgage-backed          
Fair Value          
Securities available-for-sale, at fair value 10,040,000   10,040,000   $ 11,214,000
Recurring Basis | U.S. Government and federal agency          
Fair Value          
Securities available-for-sale, at fair value 1,989,000   1,989,000   1,988,000
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government and federal agency          
Fair Value          
Securities available-for-sale, at fair value 1,989,000   1,989,000   1,988,000
Recurring Basis | Significant Other Observable Unobservable Inputs (Level 2) | Residential mortgage-backed          
Fair Value          
Securities available-for-sale, at fair value $ 10,040,000   $ 10,040,000   $ 11,214,000