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2. Investment securities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost    
Due within one year $ 8,551  
Due from one to five years 57,481  
Due from five to ten years 39,650  
Due after ten years 5,361  
Mortgage-backed securities 69,330  
Trust preferred securities 250  
Total 180,623 $ 193,296
Estimated Fair Value    
Due within one year 8,506  
Due from one to five years 59,511  
Due from five to ten years 41,658  
Due after ten years 5,638  
Mortgage-backed securities 70,700  
Trust preferred securities 250  
Total $ 186,263