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2. Investment securities (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due within one year $ 9,933  
Due from one to five years 48,311  
Due from five to ten years 48,710  
Due after ten years 16,541  
Mortgage-backed securities 74,338  
Trust preferred securities 250  
Total 198,083 $ 191,013
Estimated Fair Value    
Due within one year 10,127  
Due from one to five years 50,935  
Due from five to ten years 51,567  
Due after ten years 16,929  
Mortgage-backed securities 77,661  
Trust preferred securities 250  
Total $ 207,469