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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value    
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 | Residential mortgage-backed    
Fair Value    
Securities available-for-sale, at fair value 11,214,000 12,167,000
Recurring Basis | U.S. Government and federal agency    
Fair Value    
Securities available-for-sale, at fair value 1,988,000 1,973,000
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 1,988,000 1,973,000
Recurring Basis | Significant Other Observable Unobservable Inputs (Level 2) | Residential mortgage-backed    
Fair Value    
Securities available-for-sale, at fair value $ 11,214,000 $ 12,167,000