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Commitments and contingent liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Commitments to Extend Credit [Member]    
Other Commitments [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 3,640.0 $ 3,500.0
Standby Letters of Credit [Member]    
Other Commitments [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 35.6 $ 36.0