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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Amortized Cost    
Due within one year $ 8,444  
Due from one to five years 76,972  
Due from five to ten years 83,725  
Due after ten years 10,361  
Mortgage-backed securities 71,359  
Equity securities 264  
Total 251,125 $ 259,505
Estimated Fair Value    
Due within one year 8,500  
Due from one to five years 81,294  
Due from five to ten years 87,937  
Due after ten years 10,764  
Mortgage-backed securities 73,393  
Equity securities 535  
Total $ 262,423