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Commitments and contingencies (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Supply Commitment [Line Items]    
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 53,954 $ 51,059
Loss Contingency Accrual 412 557
Interest Rate Lock Commitments [Member]    
Supply Commitment [Line Items]    
Derivative, Notional Amount 17,500 23,700
Short [Member] | Forward Contracts [Member]    
Supply Commitment [Line Items]    
Derivative, Notional Amount 6,800 13,000
Commitments to Extend Credit [Member]    
Supply Commitment [Line Items]    
Supply Commitment, Remaining Minimum Amount Committed 1,648,190 1,592,221
Standby Letters of Credit [Member]    
Supply Commitment [Line Items]    
Supply Commitment, Remaining Minimum Amount Committed 63,349 63,753
Letter of Credit [Member]    
Supply Commitment [Line Items]    
Supply Commitment, Remaining Minimum Amount Committed 71,573 52,125
Low Income Housing Tax Credit [Member]    
Supply Commitment [Line Items]    
Supply Commitment, Remaining Minimum Amount Committed $ 31,530 $ 24,409