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Securities (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Contractual Maturities Of Available For Sale Debt Securities [Line Items]    
Estimated Fair Value, Due in one year or less $ 1,595  
Estimated Fair Value, Due from one to five years 4,787  
Estimated Fair Value, Due from five to ten years 24,533  
Estimated Fair Value, Due over ten years 71,387  
Estimated Fair Value, Total $ 241,471 $ 244,490
Tax-Equivalent Yield, Due in one year or less 6.54%  
Tax-Equivalent Yield, Due from one to five years 4.36%  
Tax-Equivalent Yield, Due from five to ten years 4.88%  
Tax-Equivalent Yield, Due over ten years 4.77%  
Tax-Equivalent Yield, Total 3.59%  
Collateralized mortgage obligations and residential mortgage-backed securities [Member]    
Contractual Maturities Of Available For Sale Debt Securities [Line Items]    
Estimated Fair Value, Total $ 139,169 $ 132,938
Tax-Equivalent Yield, Total 2.70%