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Commitments and contingencies (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Supply Commitment [Line Items]    
Loss contingencies for all legal claims $ 170 $ 755
Interest rate lock commitments    
Supply Commitment [Line Items]    
Notional amount 23,500 874
Commitments to extend credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 1,655,373 1,712,032
Standby letters of credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 85,052 69,763
Other letters of credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 61,792 65,822
Commitments to fund investments in affordable housing partnerships    
Supply Commitment [Line Items]    
Commitments and letters of credit $ 34,217 $ 46,507