Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Brokerage services income	$ 21,086	$ 20,490	$ 65,414	$ 43,868
Other revenues from operations:
Total other income	563,079	569,126	1,675,066	1,588,357
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	115,213	105,426	340,890	296,721
Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	186,577	156,876	545,874	475,889
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	21,086	20,490	65,414	43,868
Other revenues from operations:
Merchant discount and credit card fees	42,504	36,274	117,108	94,739
Other	26,048	19,828	77,317	62,749
Total other income	391,428	338,894	1,146,603	973,966
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	115,213	105,426	340,890	296,721
ASU 2014-09 [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	186,577	156,876	545,874	475,889
ASU 2014-09 [Member] | Business Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	16,234	14,376	45,874	37,570
Total other income	35,511	28,581	99,455	77,214
ASU 2014-09 [Member] | Business Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	19,277	14,205	53,581	39,644
ASU 2014-09 [Member] | Commercial Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	17,731	14,970	48,044	39,812
Other	9,878	1,879	13,040	3,890
Total other income	58,015	41,903	146,890	118,006
ASU 2014-09 [Member] | Commercial Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	30,406	25,054	85,806	74,304
ASU 2014-09 [Member] | Commercial Real Estate [Member]
Other revenues from operations:
Merchant discount and credit card fees	1,104	878	2,836	1,823
Other	1,961	2,180	8,228	5,197
Total other income	6,748	6,035	21,967	15,788
ASU 2014-09 [Member] | Commercial Real Estate [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	3,683	2,977	10,903	8,768
ASU 2014-09 [Member] | Discretionary Portfolio [Member]
Other revenues from operations:
Other	904	283	2,468	1,043
Total other income	904	283	2,468	1,043
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]
Other revenues from operations:
Other	558	1,501	3,413	4,670
Total other income	558	1,501	3,413	4,670
ASU 2014-09 [Member] | Retail Banking [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income		(20)
Other revenues from operations:
Merchant discount and credit card fees	6,874	5,912	19,408	15,741
Other	3,980	5,674	16,752	17,493
Total other income	72,077	73,262	222,150	202,968
ASU 2014-09 [Member] | Retail Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	61,223	61,696	185,990	169,734
ASU 2014-09 [Member] | All Other [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	21,086	20,510	65,414	43,868
Other revenues from operations:
Merchant discount and credit card fees	561	138	946	(207)
Other	8,767	8,311	33,416	30,456
Total other income	217,615	187,329	650,260	554,277
ASU 2014-09 [Member] | All Other [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	624	1,494	4,610	4,271
ASU 2014-09 [Member] | All Other [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 186,577	$ 156,876	$ 545,874	$ 475,889