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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amortized Cost    
Due within one year $ 3,666  
Due from one to five years 57,322  
Due from five to ten years 106,136  
Due after ten years 15,227  
Mortgage-backed securities 76,406  
Equity securities 748  
Total 259,505 $ 272,167
Estimated Fair Value    
Due within one year 3,647  
Due from one to five years 60,001  
Due from five to ten years 109,829  
Due after ten years 15,841  
Mortgage-backed securities 77,887  
Equity securities 1,325  
Total $ 268,530