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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Brokerage services income	$ 25,126	$ 24,138	$ 49,167	$ 44,328
Other revenues from operations:
Total other income	803,171	571,100	1,390,304	1,111,987
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	118,697	124,170	232,243	225,677
Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	172,463	190,084	366,265	359,297
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	25,126	24,138	49,167	44,328
Other revenues from operations:
Merchant discount and credit card fees	42,362	42,849	79,164	74,604
Other	16,286	26,490	30,940	51,269
Total other income	374,934	407,731	757,779	755,175
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	118,697	124,170	232,243	225,677
ASU 2014-09 [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	172,463	190,084	366,265	359,297
ASU 2014-09 [Member] | Business Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	16,927	16,835	31,185	29,640
Total other income	37,824	36,458	71,562	63,944
ASU 2014-09 [Member] | Business Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	20,878	19,623	40,348	34,304
ASU 2014-09 [Member] | Business Banking [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	19		29
ASU 2014-09 [Member] | Commercial Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	17,771	16,854	33,562	30,313
Other	5,931	1,259	10,602	3,162
Total other income	53,932	47,942	102,867	88,875
ASU 2014-09 [Member] | Commercial Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	30,230	29,829	58,703	55,400
ASU 2014-09 [Member] | Commercial Real Estate [Member]
Other revenues from operations:
Merchant discount and credit card fees	1,148	858	2,235	1,732
Other	1,332	3,803	2,518	6,267
Total other income	6,906	8,403	13,365	15,219
ASU 2014-09 [Member] | Commercial Real Estate [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	4,426	3,742	8,612	7,220
ASU 2014-09 [Member] | Discretionary Portfolio [Member]
Other revenues from operations:
Other	17	871	38	1,564
Total other income	17	871	38	1,564
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]
Other revenues from operations:
Other	211	1,126	551	2,855
Total other income	211	1,126	551	2,855
ASU 2014-09 [Member] | Retail Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	6,189	8,024	11,550	12,534
Other	7,668	7,673	15,074	12,772
Total other income	75,535	84,117	147,754	150,073
ASU 2014-09 [Member] | Retail Banking [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	61,678	68,420	121,130	124,767
ASU 2014-09 [Member] | All Other [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	25,126	24,138	49,167	44,328
Other revenues from operations:
Merchant discount and credit card fees	327	278	632	385
Other	1,127	11,758	2,157	24,649
Total other income	200,509	228,814	421,642	432,645
ASU 2014-09 [Member] | All Other [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1,485	2,556	3,450	3,986
ASU 2014-09 [Member] | All Other [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 172,444	$ 190,084	$ 366,236	$ 359,297