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Allowance for loan losses and credit quality Narrative Data (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Credit Loss [Abstract]          
Number of TDR loans modified within the previous twelve months that had subsequently defaulted | loan 0 1 0 1  
Troubled debt restructuring, recorded balance   $ 78   $ 78  
Number of loans receiving payment deferrals | loan 75   75   406
Outstanding balance of loans receiving payment deferrals $ 172,100   $ 172,100   $ 173,300
Outstanding accrued interest balance of loans receiving payment deferrals 1,700   1,700    
Outstanding balance of loans receiving payment deferrals subject to modification terms 39,100   39,100    
Outstanding accrued interest balance of loans receiving payment deferrals, subject to modification terms $ 735   $ 735