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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 12,140  
Due from one to five years 89,495  
Due from five to ten years 64,550  
Due after ten years 10,331  
Mortgage-backed securities 62,488  
Equity securities 250  
Total 239,254 $ 244,924
Estimated Fair Value    
Due within one year 12,273  
Due from one to five years 92,754  
Due from five to ten years 65,871  
Due after ten years 10,391  
Mortgage-backed securities 63,324  
Equity securities 250  
Total $ 244,863