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Investment Securities (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 12,173  
Due after one year through five years 68,835  
Due after five years through ten years 18,243  
Due after ten years 3,002  
Total 102,253  
Mortgage-backed securities 131,243  
Total available-for-sale securities 233,496 $ 229,706
Fair Value    
Due in one year or less 12,120  
Due after one year through five years 68,187  
Due after five years through ten years 17,287  
Due after ten years 2,946  
Total 100,540  
Mortgage-backed securities 127,061  
Total available-for-sale securities $ 227,601 $ 226,542