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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	Jun. 30, 2021	Dec. 31, 2020
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	$ 16,642	$ 16,149
Total Past Due and Non-Accrual	46,437	52,619
Current	11,994,941	11,887,401
Total Loans and Leases	12,041,378	11,940,020
Non-Accrual Loans and Leases that are Current	7,172	8,355
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	8,671	8,968
Total Past Due and Non-Accrual	10,856	9,218
Current	5,092,290	5,091,468
Total Loans and Leases	5,103,146	5,100,686
Non-Accrual Loans and Leases that are Current	5,086	5,268
Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	258	441
Total Past Due and Non-Accrual	2,443	691
Current	1,254,862	1,356,919
Total Loans and Leases	1,257,305	1,357,610
Non-Accrual Loans and Leases that are Current	217	285
Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	8,413	8,527
Total Past Due and Non-Accrual	8,413	8,527
Current	2,936,022	2,846,302
Total Loans and Leases	2,944,435	2,854,829
Non-Accrual Loans and Leases that are Current	4,869	4,983
Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	277,393	259,798
Total Loans and Leases	277,393	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
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	110,500	110,766
Total Loans and Leases	110,500	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
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	513,513	517,683
Total Loans and Leases	513,513	517,683
Non-Accrual Loans and Leases that are Current	0	0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	7,971	7,181
Total Past Due and Non-Accrual	35,581	43,401
Current	6,902,651	6,795,933
Total Loans and Leases	6,938,232	6,839,334
Non-Accrual Loans and Leases that are Current	2,086	3,087
Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	2,931	5,328
Current	361,611	390,155
Total Loans and Leases	364,542	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
Non-Accrual	2,437	3,223
Total Past Due and Non-Accrual	14,287	14,629
Current	4,249,893	4,115,884
Total Loans and Leases	4,264,180	4,130,513
Non-Accrual Loans and Leases that are Current	932	2,100
Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	5,534	3,958
Total Past Due and Non-Accrual	11,503	13,946
Current	1,583,278	1,590,592
Total Loans and Leases	1,594,781	1,604,538
Non-Accrual Loans and Leases that are Current	1,154	987
Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	6,860	9,498
Current	707,869	699,302
Total Loans and Leases	714,729	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	14,286	16,577
30 - 59 Days Past Due | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	195	191
30 - 59 Days Past Due | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	195	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	14,091	16,386
30 - 59 Days Past Due | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,645	2,556
30 - 59 Days Past Due | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,587	4,049
30 - 59 Days Past Due | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,031	3,423
30 - 59 Days Past Due | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5,828	6,358
60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,231	9,347
60 - 89 Days Past Due | Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,990	59
60 - 89 Days Past Due | Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,990	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	4,241	9,288
60 - 89 Days Past Due | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	852	1,612
60 - 89 Days Past Due | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,194	2,083
60 - 89 Days Past Due | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	440	3,378
60 - 89 Days Past Due | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	755	2,215
Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	9,278	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	9,278	10,546
Past Due 90 Days or More | Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	434	1,160
Past Due 90 Days or More | Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,069	5,274
Past Due 90 Days or More | Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	4,498	3,187
Past Due 90 Days or More | Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 277	$ 925

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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