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Investment Securities (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 9,928  
Due after one year through five years 60,479  
Due after five years through ten years 21,390  
Due after ten years 3,072  
Total 94,869  
Mortgage-backed securities 126,186  
Total available-for-sale securities 221,055 $ 229,706
Fair Value    
Due in one year or less 9,883  
Due after one year through five years 59,974  
Due after five years through ten years 20,344  
Due after ten years 3,012  
Total 93,213  
Mortgage-backed securities 122,507  
Total available-for-sale securities $ 215,720 $ 226,542