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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Summary of Amortized Cost of Loans and Leases on Nonaccrual Status (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	$ 44,077	$ 40,862
Nonaccrual loans with related allowance	7,457	11,177
Total nonaccrual loans	51,534	52,039
Multi-family
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	24,524	18,800
Nonaccrual loans with related allowance	0	2,928
Total nonaccrual loans	24,524	21,728
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	6,558	6,384
Nonaccrual loans with related allowance	393	2,069
Total nonaccrual loans	6,951	8,453
Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	2,412	3,411
Nonaccrual loans with related allowance	0	0
Total nonaccrual loans	2,412	3,411
Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	2,845	2,356
Nonaccrual loans with related allowance	0	0
Total nonaccrual loans	2,845	2,356
Residential real estate
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	7,738	9,911
Nonaccrual loans with related allowance	0	0
Total nonaccrual loans	7,738	9,911
Manufactured housing
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	0	0
Nonaccrual loans with related allowance	3,520	2,969
Total nonaccrual loans	3,520	2,969
Installment
Financing Receivable, Impaired [Line Items]
Nonaccrual loans with no related allowance	0	0
Nonaccrual loans with related allowance	3,544	3,211
Total nonaccrual loans	$ 3,544	$ 3,211

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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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-Number 229
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