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Loans and Leases Receivable and Allowance for Credit Losses - Summary of Amortized Cost of Loans and Leases on Nonaccrual Status (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | $ 40,862 | $ 13,084
Nonaccrual loans with related allowance | 11,177 | 6,937
Total nonaccrual loans | 52,039 | 20,021
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 18,800 | 4,117
Nonaccrual loans with related allowance | 2,928 | 0
Total nonaccrual loans | 21,728 | 4,117
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 6,384 | 3,083
Nonaccrual loans with related allowance | 2,069 | 1,448
Total nonaccrual loans | 8,453 | 4,531
Commercial real estate owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 3,411 | 1,109
Nonaccrual loans with related allowance | 0 | 854
Total nonaccrual loans | 3,411 | 1,963
Commercial real estate non-owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 2,356 | 76
Nonaccrual loans with related allowance | 0 | 0
Total nonaccrual loans | 2,356 | 76
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 9,911 | 4,559
Nonaccrual loans with related allowance | 0 | 1,569
Total nonaccrual loans | 9,911 | 6,128
Manufactured housing |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 0
Nonaccrual loans with related allowance | 2,969 | 1,655
Total nonaccrual loans | 2,969 | 1,655
Installment |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 140
Nonaccrual loans with related allowance | 3,211 | 1,411
Total nonaccrual loans | $ 3,211 | $ 1,551

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