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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Performance Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 9,018,298	$ 7,575,368
Threshold period past due	30 days
Loans receivable, PPP	$ 3,250,008	4,561,365
Purchased-credit-impaired loans	9,900	13,400
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,300,000	4,600,000
Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	68,433	62,045
30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	18,374	21,633
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	6,300
60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,654	13,812
90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	41,405	26,600
Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,949,865	7,513,323
Loans and leases not past due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable		4,600,000
Financial Asset, Greater Than 60 Days Past Due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	21,800
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,486,308	1,761,301
Multi-family | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	22,624	24,324
Multi-family | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,682	4,193
Multi-family | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,707	5,224
Multi-family | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	18,235	14,907
Multi-family | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,463,684	1,736,977
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,424,783	2,289,441
Commercial and industrial | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,117	6,610
Commercial and industrial | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,093	2,257
Commercial and industrial | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	95	1,274
Commercial and industrial | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,929	3,079
Commercial and industrial | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,416,666	2,282,831
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	654,922	572,338
Commercial real estate owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,591	4,558
Commercial real estate owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	287	864
Commercial real estate owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	1,324
Commercial real estate owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,304	2,370
Commercial real estate owner occupied | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	653,331	567,780
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,121,238	1,196,564
Commercial real estate non-owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,815	2,416
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	60
Commercial real estate non-owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,815	2,356
Commercial real estate non-owner occupied | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,118,423	1,194,148
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	198,981	140,905
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 Days 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	198,981	140,905
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	334,730	317,170
Residential real estate | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	9,834	10,323
Residential real estate | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,655	6,640
Residential real estate | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	789	1,827
Residential real estate | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,390	1,856
Residential real estate | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	324,896	306,847
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	52,861	62,243
Manufactured housing | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	8,025	4,142
Manufactured housing | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,308	1,518
Manufactured housing | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	768	673
Manufactured housing | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,949	1,951
Manufactured housing | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	44,836	58,101
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,744,475	1,235,406
Installment | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	15,427	9,672
Installment | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,349	6,161
Installment | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4,295	3,430
Installment | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,783	81
Installment | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,729,048	$ 1,225,734

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Financing Receivable, before Allowance for Credit Loss, Payment Protection Program, CARES Act

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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Amount at purchase price of financing receivable purchased with credit deterioration.

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-Topic 326
-SubTopic 20
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