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Commitments and contingent liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Commitments to Extend Credit [Member]      
Other Commitments [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 3,710,000 $ 3,500,000  
Standby Letters of Credit [Member]      
Other Commitments [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 34,200 $ 36,000  
Letter of Credit      
Other Commitments [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 66   $ 0