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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 13,299  
Due from one to five years 95,096  
Due from five to ten years 55,333  
Due after ten years 8,762  
Mortgage-backed securities 55,947  
Trust preferred securities 250  
Total 228,687 $ 244,924
Estimated Fair Value    
Due within one year 13,397  
Due from one to five years 99,142  
Due from five to ten years 57,069  
Due after ten years 8,985  
Mortgage-backed securities 56,893  
Trust preferred securities 250  
Total $ 235,736