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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Performance Status (Detail) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 30, 2023	Jun. 15, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 12,463,485		$ 13,144,894	$ 12,463,485		$ 12,463,485
Loans still accruing interest because collection is considered probable	600		1,900	600		600
Purchased-credit-impaired loans	195,800		8,300
Purchases				101,735	$ 137,814	750,400	$ 368,776
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	137,100		998,200	137,100		137,100
Specialty lending | FDIC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases		$ 631,000
Purchased-credit-impaired loans		$ 228,700
Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	58,529		75,345	58,529		58,529
30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	16,294		38,471	16,294		16,294
30-59 Days past due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,300		600	1,300		1,300
60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	15,216		15,570	15,216		15,216
90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	27,019		21,304	27,019		27,019
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	12,404,956		13,069,549	12,404,956		12,404,956
60 Days or More Past Due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	106,900		36,000	106,900		106,900
Commercial and industrial, including specialty lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	6,617,508		6,672,830	6,617,508		6,617,508
Commercial and industrial, including specialty lending | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,633		5,255	8,633		8,633
Commercial and industrial, including specialty lending | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,070		3,123	2,070		2,070
Commercial and industrial, including specialty lending | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,273		717	1,273		1,273
Commercial and industrial, including specialty lending | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,290		1,415	5,290		5,290
Commercial and industrial, including specialty lending | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	6,608,875		6,667,575	6,608,875		6,608,875
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,130,213		2,213,019	2,130,213		2,130,213
Multifamily | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		17,044	0		0
Multifamily | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		10,684	0		0
Multifamily | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		5,217	0		0
Multifamily | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		1,143	0		0
Multifamily | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,130,213		2,195,975	2,130,213		2,130,213
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	794,815		885,339	794,815		794,815
Commercial real estate owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	10,676		7,877	10,676		10,676
Commercial real estate owner occupied | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	50		5,173	50		50
Commercial real estate owner occupied | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,234		0	3,234		3,234
Commercial real estate owner occupied | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,392		2,704	7,392		7,392
Commercial real estate owner occupied | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	784,139		877,462	784,139		784,139
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,178,203		1,290,730	1,178,203		1,178,203
Commercial real estate non-owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		2,147	0		0
Commercial real estate non-owner occupied | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		2,136	0		0
Commercial real estate non-owner occupied | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		0	0		0
Commercial real estate non-owner occupied | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		11	0		0
Commercial real estate non-owner occupied | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,178,203		1,288,583	1,178,203		1,178,203
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	252,588		162,009	252,588		252,588
Construction | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		0	0		0
Construction | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		0	0		0
Construction | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		0	0		0
Construction | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0		0	0		0
Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	252,588		162,009	252,588		252,588
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	483,133		497,952	483,133		483,133
Purchases				0	$ 15,067	4,238	$ 170,022
Residential real estate | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	10,502		9,523	10,502		10,502
Residential real estate | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,773		5,208	3,773		3,773
Residential real estate | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,898		1,157	2,898		2,898
Residential real estate | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,831		3,158	3,831		3,831
Residential real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	472,631		488,429	472,631		472,631
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	40,129		45,076	40,129		40,129
Manufactured housing | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,247		4,784	4,247		4,247
Manufactured housing | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	673		901	673		673
Manufactured housing | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	367		537	367		367
Manufactured housing | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,207		3,346	3,207		3,207
Manufactured housing | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	35,882		40,292	35,882		35,882
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	966,896		1,377,939	966,896		966,896
Installment | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	24,471		28,715	24,471		24,471
Installment | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	9,728		11,246	9,728		9,728
Installment | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,444		7,942	7,444		7,444
Installment | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,299		9,527	7,299		7,299
Installment | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 942,425		$ 1,349,224	$ 942,425		$ 942,425

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Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

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-Topic 326
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amount excluding accrued interest, of increase in financing receivable from purchase. Excludes net investment in lease.

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Amount at par value of financing receivable purchased with credit deterioration.

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