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, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans	$ 46,917,200	$ 34,153,657
Non-Accrual Loans	269,761	240,216
Non-Accrual Loans Without Allowance for Loan Losses	102,186	100,190
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	360,649	296,080
30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	43,535	40,889
60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	20,766	12,204
90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	26,587	2,771
Current Loans
Financing Receivable, Past Due [Line Items]
Loans	46,556,551	33,857,577
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	8,804,830	5,847,551
Non-Accrual Loans	98,881	99,918
Non-Accrual Loans Without Allowance for Loan Losses	5,659	9,066
Commercial and industrial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	141,642	115,778
Commercial and industrial | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	11,664	6,717
Commercial and industrial | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	12,705	7,870
Commercial and industrial | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	18,392	1,273
Commercial and industrial | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	8,663,188	5,731,773
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	29,432,868	20,790,066
Non-Accrual Loans	142,546	101,233
Non-Accrual Loans Without Allowance for Loan Losses	82,186	70,719
Commercial real estate | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	158,633	117,627
Commercial real estate | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	6,638	16,362
Commercial real estate | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	3,167	0
Commercial real estate | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	6,282	32
Commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	29,274,235	20,672,439
Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	25,732,033	18,935,486
Non-Accrual Loans	68,316	83,592
Non-Accrual Loans Without Allowance for Loan Losses	66,066	70,719
Commercial real estate | Commercial real estate | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	80,413	98,045
Commercial real estate | Commercial real estate | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	6,638	14,421
Commercial real estate | Commercial real estate | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	3,167	0
Commercial real estate | Commercial real estate | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	2,292	32
Commercial real estate | Commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	25,651,620	18,837,441
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Loans	3,700,835	1,854,580
Non-Accrual Loans	74,230	17,641
Non-Accrual Loans Without Allowance for Loan Losses	16,120	0
Commercial real estate | Construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	78,220	19,582
Commercial real estate | Construction | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	1,941
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	3,990	0
Commercial real estate | Construction | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	3,622,615	1,834,998
Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans	5,364,550	4,545,064
Non-Accrual Loans	25,160	35,207
Non-Accrual Loans Without Allowance for Loan Losses	14,224	20,401
Residential mortgage | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	46,487	50,197
Residential mortgage | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	16,146	10,999
Residential mortgage | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	3,315	3,314
Residential mortgage | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,866	677
Residential mortgage | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	5,318,063	4,494,867
Home equity
Financing Receivable, Past Due [Line Items]
Loans	3,314,952	2,970,976
Non-Accrual Loans	3,174	3,858
Non-Accrual Loans Without Allowance for Loan Losses	117	4
Home equity | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,887	12,478
Home equity | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	9,087	6,811
Home equity | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1,579	1,020
Home equity | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	47	789
Home equity | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	3,301,065	2,958,498
Home equity | Home equity
Financing Receivable, Past Due [Line Items]
Loans	503,884	400,779
Non-Accrual Loans	2,810	3,517
Non-Accrual Loans Without Allowance for Loan Losses	117	4
Home equity | Home equity | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	4,019	3,857
Home equity | Home equity | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	955	242
Home equity | Home equity | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	254	98
Home equity | Home equity | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Home equity | Home equity | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	499,865	396,922
Home equity | Automobile
Financing Receivable, Past Due [Line Items]
Loans	1,746,225	1,570,036
Non-Accrual Loans	271	240
Non-Accrual Loans Without Allowance for Loan Losses	0	0
Home equity | Automobile | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	6,876	7,558
Home equity | Automobile | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	5,974	6,391
Home equity | Automobile | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	630	656
Home equity | Automobile | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	1	271
Home equity | Automobile | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	1,739,349	1,562,478
Home equity | Other consumer
Financing Receivable, Past Due [Line Items]
Loans	1,064,843	1,000,161
Non-Accrual Loans	93	101
Non-Accrual Loans Without Allowance for Loan Losses	0	0
Home equity | Other consumer | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,992	1,063
Home equity | Other consumer | 30-59 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	2,158	178
Home equity | Other consumer | 60-89 Days Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	695	266
Home equity | Other consumer | 90 Days or More Past Due Loans
Financing Receivable, Past Due [Line Items]
Loans	46	518
Home equity | Other consumer | Current Loans
Financing Receivable, Past Due [Line Items]
Loans	$ 1,061,851	$ 999,098