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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 17,584  
Due from one to five years 96,639  
Due from five to ten years 48,542  
Due after ten years 8,765  
Mortgage-backed securities 53,124  
Equity securities 0  
Total 224,654 $ 244,924
Estimated Fair Value    
Due within one year 17,682  
Due from one to five years 99,547  
Due from five to ten years 49,578  
Due after ten years 8,905  
Mortgage-backed securities 53,609  
Equity securities 0  
Total $ 229,321