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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost    
Due within one year $ 4,431  
Due from one to five years 57,499  
Due from five to ten years 107,022  
Due after ten years 15,622  
Mortgage-backed securities 75,386  
Equity securities 748  
Total 260,708 $ 272,167
Estimated Fair Value    
Due within one year 4,440  
Due from one to five years 60,100  
Due from five to ten years 109,524  
Due after ten years 16,117  
Mortgage-backed securities 77,466  
Equity securities 1,174  
Total $ 268,821