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2. Investment securities, Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due within one year $ 14,885  
Due from one to five years 93,690  
Due from five to ten years 56,040  
Due after ten years 9,437  
Mortgage-backed securities 59,302  
Trust preferred securities 250  
Total 233,604 $ 244,924
Estimated Fair Value    
Due within one year 15,051  
Due from one to five years 97,862  
Due from five to ten years 58,093  
Due after ten years 9,687  
Mortgage-backed securities 60,377  
Trust preferred securities 250  
Total $ 241,320