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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Performance Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 12,212,995	$ 9,018,298
Purchased-credit-impaired loans	9,000	9,900
Loans still accruing interest because collection is considered probable	1,500	1,400
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,600,000	3,300,000
Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	40,862	68,433
30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	12,626	18,374
30 to 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	3,300	6,300
60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,717	8,654
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	33,400	21,800
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	19,519	41,405
Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	12,172,133	8,949,865
Commercial and industrial, including specialty lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,737,670	3,424,783
Commercial and industrial, including specialty lending | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,597	8,117
Commercial and industrial, including specialty lending | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	340	2,093
Commercial and industrial, including specialty lending | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	339	95
Commercial and industrial, including specialty lending | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,918	5,929
Commercial and industrial, including specialty lending | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,733,073	3,416,666
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,008,784	1,486,308
Multi-family | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,153	22,624
Multi-family | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	1,682
Multi-family | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	2,707
Multi-family | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,153	18,235
Multi-family | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,007,631	1,463,684
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	710,577	654,922
Commercial real estate owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,654	1,591
Commercial real estate owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	857	287
Commercial real estate owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	648	0
Commercial real estate owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,149	1,304
Commercial real estate owner occupied | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	707,923	653,331
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,152,869	1,121,238
Commercial real estate non-owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	2,815
Commercial real estate non-owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
Commercial real estate non-owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	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	2,815
Commercial real estate non-owner occupied | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,152,869	1,118,423
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	195,687	198,981
Construction | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
Construction | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
Construction | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
Construction | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	0
Construction | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	195,687	198,981
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	457,768	334,730
Residential real estate | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,581	9,834
Residential real estate | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,689	4,655
Residential real estate | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,513	789
Residential real estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,379	4,390
Residential real estate | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	450,187	324,896
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	48,570	52,861
Manufactured housing | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,933	8,025
Manufactured housing | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	690	2,308
Manufactured housing | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	288	768
Manufactured housing | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,955	4,949
Manufactured housing | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	43,637	44,836
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,901,070	1,744,475
Installment | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	19,944	15,427
Installment | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,050	7,349
Installment | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,929	4,295
Installment | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,965	3,783
Installment | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,881,126	$ 1,729,048

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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