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Loans and Leases and the Allowance for Credit Losses - Schedule of Aging Analysis by Class of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 12,072,750	$ 11,940,020
Non-Accrual	18,288	16,149
Total Past Due and Non-Accrual	46,597	52,619
Total Loans and Leases	12,072,750	11,940,020
Non-Accrual Loans and Leases that are Current	10,243	8,355
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,992,024	5,100,686
Non-Accrual	8,518	8,968
Total Past Due and Non-Accrual	10,535	9,218
Total Loans and Leases	4,992,024	5,100,686
Non-Accrual Loans and Leases that are Current	8,481	5,268
Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,325,446	1,357,610
Non-Accrual	209	441
Total Past Due and Non-Accrual	2,226	691
Total Loans and Leases	1,325,446	1,357,610
Non-Accrual Loans and Leases that are Current	172	285
Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,994,520	2,854,829
Non-Accrual	8,309	8,527
Total Past Due and Non-Accrual	8,309	8,527
Total Loans and Leases	2,994,520	2,854,829
Non-Accrual Loans and Leases that are Current	8,309	4,983
Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	296,052	259,798
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Total Loans and Leases	296,052	259,798
Non-Accrual Loans and Leases that are Current	0	0
Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	107,526	110,766
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Total Loans and Leases	107,526	110,766
Non-Accrual Loans and Leases that are Current	0	0
Commercial | PPP Loans, Administered by the SBA
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	268,480	517,683
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Total Loans and Leases	268,480	517,683
Non-Accrual Loans and Leases that are Current	0	0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	7,080,726	6,839,334
Non-Accrual	9,770	7,181
Total Past Due and Non-Accrual	36,062	43,401
Total Loans and Leases	7,080,726	6,839,334
Non-Accrual Loans and Leases that are Current	1,762	3,087
Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	3,403	5,328
Total Loans and Leases	400,723	395,483
Non-Accrual Loans and Leases that are Current	0	0
Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,272,540	4,130,513
Non-Accrual	4,348	3,223
Total Past Due and Non-Accrual	13,451	14,629
Total Loans and Leases	4,272,540	4,130,513
Non-Accrual Loans and Leases that are Current	528	2,100
Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	5,422	3,958
Total Past Due and Non-Accrual	11,276	13,946
Total Loans and Leases	1,680,229	1,604,538
Non-Accrual Loans and Leases that are Current	1,234	987
Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	727,234	708,800
Non-Accrual	0	0
Total Past Due and Non-Accrual	7,932	9,498
Total Loans and Leases	727,234	708,800
Non-Accrual Loans and Leases that are Current	0	0
30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	11,917	16,577
30 - 59 Days Past Due | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	130	191
30 - 59 Days Past Due | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	130	191
30 - 59 Days Past Due | Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
30 - 59 Days Past Due | Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
30 - 59 Days Past Due | Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
30 - 59 Days Past Due | Commercial | PPP Loans, Administered by the SBA
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
30 - 59 Days Past Due | Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	11,787	16,386
30 - 59 Days Past Due | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,067	2,556
30 - 59 Days Past Due | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,074	4,049
30 - 59 Days Past Due | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,219	3,423
30 - 59 Days Past Due | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,427	6,358
60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	7,682	9,347
60 - 89 Days Past Due | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,887	59
60 - 89 Days Past Due | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,887	59
60 - 89 Days Past Due | Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
60 - 89 Days Past Due | Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
60 - 89 Days Past Due | Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
60 - 89 Days Past Due | Commercial | PPP Loans, Administered by the SBA
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
60 - 89 Days Past Due | Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,795	9,288
60 - 89 Days Past Due | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	743	1,612
60 - 89 Days Past Due | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	3,253	2,083
60 - 89 Days Past Due | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	689	3,378
60 - 89 Days Past Due | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,110	2,215
Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	8,710	10,546
Past Due 90 Days or More | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Commercial | PPP Loans, Administered by the SBA
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Past Due 90 Days or More | Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	8,710	10,546
Past Due 90 Days or More | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	593	1,160
Past Due 90 Days or More | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,776	5,274
Past Due 90 Days or More | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,946	3,187
Past Due 90 Days or More | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	395	925
Current
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	12,026,153	11,887,401
Current | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,981,489	5,091,468
Current | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,323,220	1,356,919
Current | Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,986,211	2,846,302
Current | Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	296,052	259,798
Current | Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	107,526	110,766
Current | Commercial | PPP Loans, Administered by the SBA
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	268,480	517,683
Current | Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	7,044,664	6,795,933
Current | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	397,320	390,155
Current | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,259,089	4,115,884
Current | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,668,953	1,590,592
Current | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 719,302	$ 699,302

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