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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | $ 33,939 | $ 13,084
Nonaccrual loans with related allowance | 9,941 | 6,937
Total nonaccrual loans | 43,880 | 20,021
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 8,749 | 4,117
Nonaccrual loans with related allowance | 2,961 | 0
Total nonaccrual loans | 11,710 | 4,117
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 8,749 | 3,083
Nonaccrual loans with related allowance | 884 | 1,448
Total nonaccrual loans | 9,633 | 4,531
Commercial real estate owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 3,399 | 1,109
Nonaccrual loans with related allowance | 200 | 854
Total nonaccrual loans | 3,599 | 1,963
Commercial real estate non-owner occupied |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 2,408 | 76
Nonaccrual loans with related allowance | 0 | 0
Total nonaccrual loans | 2,408 | 76
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 10,634 | 4,559
Nonaccrual loans with related allowance | 0 | 1,569
Total nonaccrual loans | 10,634 | 6,128
Manufactured housing |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 0
Nonaccrual loans with related allowance | 2,778 | 1,655
Total nonaccrual loans | 2,778 | 1,655
Installment |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance | 0 | 140
Nonaccrual loans with related allowance | 3,118 | 1,411
Total nonaccrual loans | $ 3,118 | $ 1,551

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