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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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 166,605	$ 203,399	$ 196,711	$ 218,583
Charge-offs	(2,093)	(5,068)	(41,619)	(45,243)
Recoveries	920	1,941	3,940	8,432
Provision	22,000	(4,000)	28,400	14,500
Ending balance - ACL	187,432	196,272	187,432	196,272
Beginning balance - ACL on off-balance sheet	3,088	3,588	2,588	5,588
Provision		(1,000)	500	(3,000)
Ending balance - ACL on off-balance sheet	3,088	2,588	3,088	2,588
Commercial and Industrial Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	112,942	118,121	123,732	122,700
Charge-offs		(1,592)	(36,217)	(6,311)
Recoveries	29	1,165	1,419	4,926
Provision	20,134	(12,559)	44,171	(16,180)
Ending balance - ACL	133,105	105,135	133,105	105,135
Beginning balance - ACL on off-balance sheet	2,178	2,344	1,739	3,859
Provision		(605)	439	(2,120)
Ending balance - ACL on off-balance sheet	2,178	1,739	2,178	1,739
Specialty Lending Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,133	5,901	1,738	5,219
Charge-offs				(31,945)
Recoveries	429	3	430	154
Provision	(1,562)	816	(2,168)	33,292
Ending balance - ACL		6,720		6,720
Beginning balance - ACL on off-balance sheet	186	213	160	287
Provision		(53)	26	(127)
Ending balance - ACL on off-balance sheet	186	160	186	160
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	37,240	56,734	56,265	61,931
Charge-offs		(77)		(77)
Recoveries		213	385	1,560
Provision	909	10,663	(18,501)	4,119
Ending balance - ACL	38,149	67,533	38,149	67,533
Beginning balance - ACL on off-balance sheet	418	326	480	447
Provision		154	(62)	33
Ending balance - ACL on off-balance sheet	418	480	418	480
Consumer Real Estate Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	4,565	5,807	3,921	6,586
Charge-offs			(57)	(86)
Recoveries	11	16	121	129
Provision	422	360	1,013	(446)
Ending balance - ACL	4,998	6,183	4,998	6,183
Beginning balance - ACL on off-balance sheet	124	142	106	145
Provision		(36)	18	(39)
Ending balance - ACL on off-balance sheet	124	106	124	106
Consumer Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	863	857	845	1,480
Charge-offs	(241)	(1,782)	(560)	(2,030)
Recoveries	29	83	89	170
Provision	(223)	1,856	54	1,394
Ending balance - ACL	428	1,014	428	1,014
Beginning balance - ACL on off-balance sheet	13	208		381
Provision		(208)	13	(381)
Ending balance - ACL on off-balance sheet	13		13
Credit Cards Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	5,579	11,743	6,075	15,786
Charge-offs	(1,852)	(1,617)	(4,785)	(4,786)
Recoveries	422	461	1,496	1,475
Provision	2,426	(4,265)	3,789	(6,153)
Ending balance - ACL	6,575	6,322	6,575	6,322
Leases and Other Portfolio [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,024	1,400	2,195	2,271
Charge-offs				(8)
Recoveries				18
Provision	(366)	(151)	(537)	(1,032)
Ending balance - ACL	1,658	1,249	1,658	1,249
Beginning balance - ACL on off-balance sheet	62	264	15	414
Provision		(249)	47	(399)
Ending balance - ACL on off-balance sheet	62	15	62	15
Total - Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	164,346	200,563	194,771	215,973
Charge-offs	(2,093)	(5,068)	(41,619)	(45,243)
Recoveries	920	1,941	3,940	8,432
Provision	21,740	(3,280)	27,821	14,994
Ending balance - ACL	184,913	194,156	184,913	194,156
Beginning balance - ACL on off-balance sheet	2,981	3,497	2,500	5,533
Provision		(997)	481	(3,033)
Ending balance - ACL on off-balance sheet	2,981	2,500	2,981	2,500
HTM [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,259	2,836	1,940	2,610
Provision	260	(720)	579	(494)
Ending balance - ACL	2,519	2,116	2,519	2,116
Beginning balance - ACL on off-balance sheet	107	91	88	55
Provision		(3)	19	33
Ending balance - ACL on off-balance sheet	$ 107	$ 88	$ 107	$ 88

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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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