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2. Investment securities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due within one year $ 9,837  
Due from one to five years 24,402  
Due from five to ten years 61,085  
Due after ten years 7,351  
Mortgage-backed securities 112,274  
Trust preferred securities 250  
Total 215,199 $ 191,013
Estimated Fair Value    
Due within one year 9,988  
Due from one to five years 25,770  
Due from five to ten years 64,485  
Due after ten years 7,515  
Mortgage-backed securities 114,983  
Trust preferred securities 250  
Total $ 222,991