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Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Commercial and other    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 3,642,545 $ 3,689,700
Home equity    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 1,475,066 1,422,284
Commerical mortgage and construction    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 1,188,972 1,093,045
Total commitments to extend credit    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 6,306,583 6,205,029
Standby letters of credit    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 309,352 326,973
Commercial letters of credit    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 48,682 41,801
Letter of Credit [Member]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 358,034 $ 368,774