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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, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 7,772,142	$ 7,575,368
Threshold period past due	30 days
Loans receivable, PPP	$ 6,305,056	4,561,365
Purchased-credit-impaired loans	11,700	13,400
Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	51,199	62,045
30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,413	21,633
60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,755	13,812
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	36,031	26,600
Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,720,943	7,513,323
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,497,485	1,761,301
Multi-family | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	18,359	24,324
Multi-family | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	0	4,193
Multi-family | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	3,355	5,224
Multi-family | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	15,004	14,907
Multi-family | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,479,126	1,736,977
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,360,656	2,289,441
Commercial and industrial | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	7,737	6,610
Commercial and industrial | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	4	2,257
Commercial and industrial | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,318	1,274
Commercial and industrial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	6,415	3,079
Commercial and industrial | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,352,919	2,282,831
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	653,649	572,338
Commercial real estate owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,684	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	0	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 Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,684	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	651,965	567,780
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,206,646	1,196,564
Commercial real estate non-owner occupied | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	12	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	12	60
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	2,356
Commercial real estate non-owner occupied | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,206,634	1,194,148
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	179,198	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 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	179,198	140,905
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	266,911	317,170
Residential real estate | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,764	10,323
Residential real estate | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	56	6,640
Residential real estate | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	679	1,827
Residential real estate | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,029	1,856
Residential real estate | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	261,147	306,847
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	57,904	62,243
Manufactured housing | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	6,795	4,142
Manufactured housing | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,387	1,518
Manufactured housing | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	237	673
Manufactured housing | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,171	1,951
Manufactured housing | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	51,109	58,101
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,549,693	1,235,406
Installment | Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	10,848	9,672
Installment | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,966	6,161
Installment | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,154	3,430
Installment | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,728	81
Installment | Loans and leases not past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,538,845	$ 1,225,734

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

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Amount at purchase price of financing receivable purchased with credit deterioration.

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