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Investment securities (Details 2) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Amortized Cost    
Due within one year $ 12,347,000  
Due from one to five years 10,160,000  
Due from five to ten years 102,044,000  
Due after ten years 30,546,000  
Mortgage-backed securities 207,289,000  
Total 362,386,000 $ 238,236,000
Estimated Fair Value    
Due within one year 12,511,000  
Due from one to five years 10,812,000  
Due from five to ten years 104,879,000  
Due after ten years 30,209,000  
Mortgage-backed securities 209,118,000  
Total $ 367,529,000