Loans and Allowance for Credit Losses for Loans - Past Due, Current, and Non-Accrual Loans Without an Allowance for Credit Losses by Loan Portfolio Class (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 48,799,711	$ 50,210,295
Non-Accrual Loans	359,498	291,871
Non-Accrual Loans Without Allowance for Loan Losses	136,928	115,126
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	458,692	383,497
30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	57,138	59,214
60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	36,167	19,267
90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	5,889	13,145
Current Loans
Financing Receivable, Past Due [Line Items]
Loans	48,341,019	49,826,798
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	9,931,400	9,230,543
Non-Accrual Loans	136,675	99,912
Non-Accrual Loans Without Allowance for Loan Losses	15,947	6,594
Commercial and industrial | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	141,378	119,893
Commercial and industrial | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	2,389	9,307
Commercial and industrial | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,007	5,095
Commercial and industrial | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,307	5,579
Commercial and industrial | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	9,790,022	9,110,650
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	29,644,958	31,970,047
Non-Accrual Loans	181,822	160,590
Non-Accrual Loans Without Allowance for Loan Losses	96,097	93,289
Commercial real estate | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	227,627	168,845
Commercial real estate | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	20,902	3,008
Commercial real estate | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	24,903	1,257
Commercial real estate | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	3,990
Commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	29,417,331	31,801,202
Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	26,530,225	28,243,239
Non-Accrual Loans	157,231	99,739
Non-Accrual Loans Without Allowance for Loan Losses	91,095	81,282
Commercial real estate | Commercial real estate | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	203,036	104,004
Commercial real estate | Commercial real estate | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	20,902	3,008
Commercial real estate | Commercial real estate | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	24,903	1,257
Commercial real estate | Commercial real estate | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	26,327,189	28,139,235
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Loans	3,114,733	3,726,808
Non-Accrual Loans	24,591	60,851
Non-Accrual Loans Without Allowance for Loan Losses	5,002	12,007
Commercial real estate | Construction | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	24,591	64,841
Commercial real estate | Construction | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Construction | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Construction | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	3,990
Commercial real estate | Construction | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	3,090,142	3,661,967
Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans	5,632,516	5,569,010
Non-Accrual Loans	36,786	26,986
Non-Accrual Loans Without Allowance for Loan Losses	23,543	14,654
Residential mortgage | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	67,387	64,019
Residential mortgage | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	21,295	26,345
Residential mortgage | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	5,773	8,200
Residential mortgage | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	3,533	2,488
Residential mortgage | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	5,565,129	5,504,991
Consumer
Financing Receivable, Past Due [Line Items]
Loans	3,590,837	3,440,695
Non-Accrual Loans	4,215	4,383
Non-Accrual Loans Without Allowance for Loan Losses	1,341	589
Consumer | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	22,300	30,740
Consumer | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	12,552	20,554
Consumer | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	4,484	4,715
Consumer | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,049	1,088
Consumer | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	3,568,537	3,409,955
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Loans	604,433	559,152
Non-Accrual Loans	3,961	3,539
Non-Accrual Loans Without Allowance for Loan Losses	1,341	0
Consumer | Home equity | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	5,793	5,839
Consumer | Home equity | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,651	1,687
Consumer | Home equity | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	181	613
Consumer | Home equity | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer | Home equity | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	598,640	553,313
Consumer | Automobile
Financing Receivable, Past Due [Line Items]
Loans	1,901,065	1,620,389
Non-Accrual Loans	230	212
Non-Accrual Loans Without Allowance for Loan Losses	0	0
Consumer | Automobile | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	10,566	14,493
Consumer | Automobile | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	8,583	11,850
Consumer | Automobile | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,346	1,855
Consumer | Automobile | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	407	576
Consumer | Automobile | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	1,890,499	1,605,896
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans	1,085,339	1,261,154
Non-Accrual Loans	24	632
Non-Accrual Loans Without Allowance for Loan Losses	0	589
Consumer | Other consumer | Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	5,941	10,408
Consumer | Other consumer | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	2,318	7,017
Consumer | Other consumer | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	2,957	2,247
Consumer | Other consumer | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	642	512
Consumer | Other consumer | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	$ 1,079,398	$ 1,250,746