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Commitments and Contingencies - Commitments and letters of credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Supply Commitment [Line Items]    
Commitments and letters of credit $ 1,894,124 $ 1,714,343
Low Income Housing Tax Credit [Member]    
Supply Commitment [Line Items]    
Commitments and letters of credit 46,507 38,467
Unused Credit Extensions    
Supply Commitment [Line Items]    
Commitments and letters of credit 1,712,032 1,526,981
Standby Letters of Credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 69,763 74,748
Other Commercial Letters of Credit    
Supply Commitment [Line Items]    
Commitments and letters of credit $ 65,822 $ 74,147