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Securities (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized cost and fair value of the debt securities maturity    
Amortized Cost, Within one year $ 11,302  
Amortized Cost, One to five years 47,214  
Amortized Cost, Five to ten years 123,704  
Amortized Cost, Beyond ten years 16,621  
Amortized Cost, Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities 193,903  
Amortized Cost, Total 392,744  
Fair Value, Within one year 11,255  
Fair Value, One to five years 47,035  
Fair Value, Five to ten years 123,070  
Fair Value, Beyond ten years 15,864  
Fair Value, Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities 187,172  
Fair Value, Total $ 384,396 $ 392,937