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Available-for-Sale Securities (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of amortized cost and fair value of securities available for sale by contractual maturity    
Available for Sale, Amortized Cost, Within one year $ 1,560  
Available for Sale, Amortized Cost, Due after one year through five years 7,363  
Available for Sale, Amortized Cost, Due after five years through ten years 10,624  
Available for Sale, Amortized Cost, Due after ten years 5,997  
Available for Sale, Amortized Cost 25,544  
Available for Sale, Amortized Cost, Totals 82,969 $ 90,052
Available for Sale, Fair Value, Within one year 1,590  
Available for Sale, Fair Value, Due after one year through five years 7,427  
Available for Sale, Fair value, Due after five years through ten years 10,731  
Available for Sale, Fair Value, Due after ten years 6,210  
Available for Sale, Fair Value 25,958  
Available for Sale, Fair Value, Totals 82,790 $ 90,128
Available for Sale, Amortized Cost, Mortgage-backed securities and equity securities 57,425  
Available for Sale, Fair Value, Mortgage-backed securities and equity securities $ 56,832