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Investment Securities (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 16,968  
Due after one year through five years 65,499  
Due after five years through ten years 14,151  
Due after ten years 7,649  
Total 104,267  
Mortgage-backed securities 127,375  
Total available-for-sale securities 231,642 $ 234,192
Fair Value    
Due in one year or less 16,846  
Due after one year through five years 64,046  
Due after five years through ten years 13,705  
Due after ten years 7,467  
Total 102,064  
Mortgage-backed securities 122,498  
Total available-for-sale securities $ 224,562 $ 231,028