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Allowance for Loan and Lease Losses - Credit Risk Profiles (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
factor
Dec. 31, 2018
USD ($)
Credit quality    
Percentage of loans sold with no recourse not subject to grading 100.00%  
Number of risk factors in internal loan rating system | factor 8  
Loans and leases $ 13,197,454 $ 13,076,191
Loss    
Credit quality    
Loans and leases 0 0
Commercial Lending    
Credit quality    
Loans and leases 7,092,552 6,974,069
Commercial Lending | Pass    
Credit quality    
Loans and leases 6,842,154 6,718,416
Commercial Lending | Special mention    
Credit quality    
Loans and leases 162,800 149,733
Commercial Lending | Substandard    
Credit quality    
Loans and leases 87,598 105,728
Commercial Lending | Doubtful    
Credit quality    
Loans and leases   192
Commercial and Industrial    
Credit quality    
Loans and leases 3,203,770 3,208,760
Commercial and Industrial | Pass    
Credit quality    
Loans and leases 3,102,106 3,069,546
Commercial and Industrial | Special mention    
Credit quality    
Loans and leases 60,275 57,012
Commercial and Industrial | Substandard    
Credit quality    
Loans and leases 41,389 82,010
Commercial and Industrial | Doubtful    
Credit quality    
Loans and leases   192
Commercial Real Estate    
Credit quality    
Loans and leases 3,147,304 2,990,783
Commercial Real Estate | Pass    
Credit quality    
Loans and leases 3,000,806 2,876,907
Commercial Real Estate | Special mention    
Credit quality    
Loans and leases 101,393 91,298
Commercial Real Estate | Substandard    
Credit quality    
Loans and leases 45,105 22,578
Construction    
Credit quality    
Loans and leases 595,491 626,757
Construction | Pass    
Credit quality    
Loans and leases 594,368 625,607
Construction | Special mention    
Credit quality    
Loans and leases 185 200
Construction | Substandard    
Credit quality    
Loans and leases 938 950
Lease Financing    
Credit quality    
Loans and leases 145,987 147,769
Lease Financing | Pass    
Credit quality    
Loans and leases 144,874 146,356
Lease Financing | Special mention    
Credit quality    
Loans and leases 947 1,223
Lease Financing | Substandard    
Credit quality    
Loans and leases 166 190
Residential and consumer    
Credit quality    
Loans and leases 6,104,902 6,102,122
Residential and consumer | Performing    
Credit quality    
Loans and leases 6,057,045 6,040,469
Residential and consumer | Non-performing and delinquent    
Credit quality    
Loans and leases 47,857 61,653
Residential Mortgage    
Credit quality    
Loans and leases 3,543,964 3,527,101
Residential Mortgage | Performing    
Credit quality    
Loans and leases 3,538,122 3,519,172
Residential Mortgage | Non-performing and delinquent    
Credit quality    
Loans and leases 5,842 7,929
Home Equity Line    
Credit quality    
Loans and leases 907,829 912,517
Home Equity Line | Performing    
Credit quality    
Loans and leases 901,821 903,284
Home Equity Line | Non-performing and delinquent    
Credit quality    
Loans and leases 6,008 9,233
Consumer    
Credit quality    
Loans and leases 1,653,109 1,662,504
Consumer loans | Consumer    
Credit quality    
Loans and leases 239,660 239,906
Consumer loans | Consumer | Performing    
Credit quality    
Loans and leases 234,539 234,458
Consumer loans | Consumer | Non-performing and delinquent    
Credit quality    
Loans and leases 5,121 5,448
Consumer - Auto | Consumer    
Credit quality    
Loans and leases 1,082,943 1,078,132
Consumer - Auto | Consumer | Performing    
Credit quality    
Loans and leases 1,056,907 1,044,393
Consumer - Auto | Consumer | Non-performing and delinquent    
Credit quality    
Loans and leases 26,036 33,739
Credit Cards | Consumer    
Credit quality    
Loans and leases 330,506 344,466
Credit Cards | Consumer | Performing    
Credit quality    
Loans and leases 325,656 339,162
Credit Cards | Consumer | Non-performing and delinquent    
Credit quality    
Loans and leases $ 4,850 $ 5,304