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Allowance for loan losses and credit quality Narrative Data (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
loans
Mar. 31, 2019
loans
Apr. 30, 2020
USD ($)
loans
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of TDR loans modified within the previous twelve months that had subsequently defaulted 0 0  
Subsequent Event [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans receiving payment deferrals     335
Outstanding balance of loans receiving payment deferrals | $     $ 160.5