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Securities - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortized cost and fair values of securities    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost $ 73,507  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 509  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 74,016  
Amortized Cost 87,808 $ 92,876
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 73,507  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value   509
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 74,016  
Debt Securities, Available-for-sale 88,179 93,383
Mortgage - backed securities - residential [Member]    
Amortized cost and fair values of securities    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 10,116  
Amortized Cost 10,116 11,969
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 10,478  
Debt Securities, Available-for-sale 10,478 12,472
Collateralized mortgage obligations - residential [Member]    
Amortized cost and fair values of securities    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 3,676  
Amortized Cost 3,676 4,481
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 3,685  
Debt Securities, Available-for-sale 3,685 4,486
Collateral Pledged [Member]    
Amortized cost and fair values of securities    
Debt Securities, Available-for-sale, Restricted $ 2,700 $ 3,700