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Fair Value (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
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 12,322,000   12,322,000   $ 12,167,000
Recurring basis | U.S. Government and federal agency          
Fair Value          
Securities available-for-sale, at fair value 2,014,000   2,014,000   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 2,014,000   2,014,000   1,973,000
Recurring basis | Significant Other Observable Unobservable Inputs (Level 2) | Residential mortgage-backed          
Fair Value          
Securities available-for-sale, at fair value $ 12,322,000   $ 12,322,000   $ 12,167,000