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Loans and Allowance for Credit Losses - Rollforward of Allowance for Credit/Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 181,333	$ 205,773	$ 196,711	$ 218,583
Charge-offs	(29,669)	(33,573)	(39,526)	(40,175)
Recoveries	1,541	5,199	3,020	6,491
Provision	13,400	26,000	6,400	18,500
Ending balance - ACL	166,605	203,399	166,605	203,399
Beginning balance - ACL on off-balance sheet	3,088	5,588	2,588	5,588
Provision		(2,000)	500	(2,000)
Ending balance - ACL on off-balance sheet	3,088	3,588	3,088	3,588
Commercial and Industrial Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	118,668	119,568	123,732	122,700
Charge-offs	(28,015)	(2)	(36,217)	(4,719)
Recoveries	729	3,635	1,390	3,761
Provision	21,560	(5,080)	24,037	(3,621)
Ending balance - ACL	112,942	118,121	112,942	118,121
Beginning balance - ACL on off-balance sheet	2,178	3,859	1,739	3,859
Provision		(1,515)	439	(1,515)
Ending balance - ACL on off-balance sheet	2,178	2,344	2,178	2,344
Specialty Lending Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	861	4,673	1,738	5,219
Charge-offs		(31,945)		(31,945)
Recoveries	1	36	1	151
Provision	271	33,137	(606)	32,476
Ending balance - ACL	1,133	5,901	1,133	5,901
Beginning balance - ACL on off-balance sheet	186	287	160	287
Provision		(74)	26	(74)
Ending balance - ACL on off-balance sheet	186	213	186	213
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	47,310	60,043	56,265	61,931
Recoveries	23	838	385	1,347
Provision	(10,093)	(4,147)	(19,410)	(6,544)
Ending balance - ACL	37,240	56,734	37,240	56,734
Beginning balance - ACL on off-balance sheet	418	447	480	447
Provision		(121)	(62)	(121)
Ending balance - ACL on off-balance sheet	418	326	418	326
Consumer Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	4,037	4,183	3,921	6,586
Charge-offs	(25)	(10)	(57)	(86)
Recoveries	82	54	110	113
Provision	471	1,580	591	(806)
Ending balance - ACL	4,565	5,807	4,565	5,807
Beginning balance - ACL on off-balance sheet	124	145	106	145
Provision		(3)	18	(3)
Ending balance - ACL on off-balance sheet	124	142	124	142
Consumer Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	418	603	845	1,480
Charge-offs	(161)	(139)	(319)	(248)
Recoveries	31	64	60	87
Provision	575	329	277	(462)
Ending balance - ACL	863	857	863	857
Beginning balance - ACL on off-balance sheet	13	381		381
Provision		(173)	13	(173)
Ending balance - ACL on off-balance sheet	13	208	13	208
Credit Cards Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	5,819	12,144	6,075	15,786
Charge-offs	(1,468)	(1,477)	(2,933)	(3,169)
Recoveries	675	572	1,074	1,014
Provision	553	504	1,363	(1,888)
Ending balance - ACL	5,579	11,743	5,579	11,743
Leases and Other Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,175	1,600	2,195	2,271
Charge-offs				(8)
Recoveries				18
Provision	(151)	(200)	(171)	(881)
Ending balance - ACL	2,024	1,400	2,024	1,400
Beginning balance - ACL on off-balance sheet	62	414	15	414
Provision		(150)	47	(150)
Ending balance - ACL on off-balance sheet	62	264	62	264
Total - Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	179,288	202,814	194,771	215,973
Charge-offs	(29,669)	(33,573)	(39,526)	(40,175)
Recoveries	1,541	5,199	3,020	6,491
Provision	13,186	26,123	6,081	18,274
Ending balance - ACL	164,346	200,563	164,346	200,563
Beginning balance - ACL on off-balance sheet	2,981	5,533	2,500	5,533
Provision		(2,036)	481	(2,036)
Ending balance - ACL on off-balance sheet	2,981	3,497	2,981	3,497
HTM [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,045	2,959	1,940	2,610
Provision	214	(123)	319	226
Ending balance - ACL	2,259	2,836	2,259	2,836
Beginning balance - ACL on off-balance sheet	107	55	88	55
Provision		36	19	36
Ending balance - ACL on off-balance sheet	$ 107	$ 91	$ 107	$ 91

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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