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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	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	$ 11,884,664	$ 11,889,120
Loans still accruing interest because collection is considered probable	500	500
Purchased-credit-impaired loans	154,000	157,200
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	52,000	74,700
Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	103,840	93,956
30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	66,750	55,532
30-59 Days past due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	2,700	700
60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	6,327	14,600
90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	30,763	23,824
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	11,780,824	11,795,164
60 Days or More Past Due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	32,300	48,500
Commercial and industrial, including specialized lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	6,274,501	6,211,105
Commercial and industrial, including specialized lending | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	8,714	5,991
Commercial and industrial, including specialized lending | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	5,910	1,516
Commercial and industrial, including specialized lending | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	180	322
Commercial and industrial, including specialized lending | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	2,624	4,153
Commercial and industrial, including specialized lending | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	6,265,787	6,205,114
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	2,123,675	2,138,622
Multifamily | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	15,492	16,003
Multifamily | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	10,331	16,003
Multifamily | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Multifamily | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	5,161	0
Multifamily | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	2,108,183	2,122,619
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	806,278	797,319
Commercial real estate owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	12,018	10,090
Commercial real estate owner occupied | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	3,135	449
Commercial real estate owner occupied | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	3,814
Commercial real estate owner occupied | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	8,883	5,827
Commercial real estate owner occupied | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	794,260	787,229
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	1,182,084	1,177,650
Commercial real estate non-owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	27,694	16,653
Commercial real estate non-owner occupied | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	27,632	16,653
Commercial real estate non-owner occupied | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Commercial real estate non-owner occupied | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	62	0
Commercial real estate non-owner occupied | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	1,154,390	1,160,997
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	185,601	166,393
Construction | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Construction | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Construction | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Construction | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	0	0
Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	185,601	166,393
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	482,537	484,435
Residential real estate | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	16,375	16,523
Residential real estate | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	11,289	10,504
Residential real estate | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	786	2,255
Residential real estate | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	4,300	3,764
Residential real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	466,162	467,912
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	37,382	38,670
Manufactured housing | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	3,805	4,364
Manufactured housing | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	629	1,152
Manufactured housing | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	401	343
Manufactured housing | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	2,775	2,869
Manufactured housing | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	33,577	34,306
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	792,606	874,926
Installment | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	19,742	24,332
Installment | 30-59 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	7,824	9,255
Installment | 60-89 Days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	4,960	7,866
Installment | 90 Days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	6,958	7,211
Installment | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total consumer loans receivable	$ 772,864	$ 850,594

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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 at purchase price of financing receivable purchased with credit deterioration.

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