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Revenue Recognition - Summary of Disaggregation of Revenue According to Revenue Stream and Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	$ 1,043	$ 13,573	$ 31,481	$ 31,461
Noninterest income	107,907	112,996	348,393	331,876
Trust and Securities Processing [Member]
Disaggregation Of Revenue [Line Items]
Noninterest income	56,914	50,552	165,611	143,873
Trading and Investment Banking [Member]
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	5,807	8,604	23,212	22,499
Noninterest income	5,936	8,678	23,962	23,252
Service Charges On Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	88	56	236	148
Noninterest income	19,881	19,650	64,449	63,805
Insurance Fees and Commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest income	285	259	950	1,051
Brokerage Fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest income	2,899	4,819	8,825	20,432
Bankcard Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	(8,363)	(7,578)	(24,789)	(21,944)
Noninterest income	17,198	15,295	47,934	44,756
Investment Securities Gains (Losses), Net [Member]
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	(3,510)	(475)	3,609	7,624
Noninterest income	(3,510)	(475)	3,609	7,624
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue (Expense) out of Scope of ASC 606	7,021	12,966	29,213	23,134
Noninterest income	8,304	14,218	33,053	27,083
Commercial Banking [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	23,275	20,689	66,231	61,147
Noninterest income	16,523	22,464	60,294	57,782
Commercial Banking [Member] | Service Charges On Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	7,918	7,428	23,676	21,211
Commercial Banking [Member] | Brokerage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	16	67	90	184
Commercial Banking [Member] | Bankcard Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	15,132	12,954	41,829	38,855
Commercial Banking [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	209	240	636	897
Institutional Banking [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	58,675	52,286	174,298	162,034
Noninterest income	65,551	62,688	202,718	191,128
Institutional Banking [Member] | Trust and Securities Processing [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	42,697	34,188	120,300	96,805
Institutional Banking [Member] | Trading and Investment Banking [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	129	74	750	753
Institutional Banking [Member] | Service Charges On Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	9,867	10,180	34,876	36,249
Institutional Banking [Member] | Brokerage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	851	2,775	2,843	14,187
Institutional Banking [Member] | Bankcard Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	4,727	4,706	14,310	12,965
Institutional Banking [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	404	363	1,219	1,075
Personal Banking [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	24,914	26,448	76,383	77,234
Noninterest income	25,833	27,844	85,381	82,966
Personal Banking [Member] | Trust and Securities Processing [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	14,217	16,364	45,311	47,068
Personal Banking [Member] | Service Charges On Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	2,008	1,986	5,661	6,197
Personal Banking [Member] | Insurance Fees and Commissions [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	285	259	950	1,051
Personal Banking [Member] | Brokerage Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	2,032	1,977	5,892	6,061
Personal Banking [Member] | Bankcard Fees [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	5,702	5,213	16,584	14,880
Personal Banking [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue Scope of ASC 606	$ 670	$ 649	$ 1,985	$ 1,977

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