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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | $ 42,666 | $ 40,862
Nonaccrual loans with related allowance | 5,415 | 11,177
Total nonaccrual loans | 48,081 | 52,039
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 20,530 | 18,800
Nonaccrual loans with related allowance | 0 | 2,928
Total nonaccrual loans | 20,530 | 21,728
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 7,282 | 6,384
Nonaccrual loans with related allowance | 262 | 2,069
Total nonaccrual loans | 7,544 | 8,453
Commercial real estate owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 3,242 | 3,411
Nonaccrual loans with related allowance | 0 | 0
Total nonaccrual loans | 3,242 | 3,411
Commercial real estate non-owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 2,259 | 2,356
Nonaccrual loans with related allowance | 97 | 0
Total nonaccrual loans | 2,356 | 2,356
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 9,353 | 9,911
Nonaccrual loans with related allowance | 0 | 0
Total nonaccrual loans | 9,353 | 9,911
Manufactured housing |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 0
Nonaccrual loans with related allowance | 2,871 | 2,969
Total nonaccrual loans | 2,871 | 2,969
Installment |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 0
Nonaccrual loans with related allowance | 2,185 | 3,211
Total nonaccrual loans | $ 2,185 | $ 3,211

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