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Allowance for Loan and Lease Losses - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 39,182 | $ 56,936
Impaired loans with no related allowance, Interest Income Recognized | 692 | 3,516
Impaired loans with an allowance recorded, Recorded Investment | 6,169 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 716 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 75 | 13
Total impaired loans, Recorded Investment | 45,351 | 58,381
Total impaired loans, Interest Income Recognized | 767 | 3,529
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 3,577
Impaired loans with no related allowance, Interest Income Recognized |  | 266
Impaired loans with an allowance recorded, Recorded Investment | 4,068 |
Impaired loans with an allowance recorded, Related Allowance | 444 |
Impaired loans with an allowance recorded, Interest Income Recognized | 28 |
Total impaired loans, Recorded Investment | 4,068 | 3,577
Total impaired loans, Interest Income Recognized | 28 | 266
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 12,006 | 14,717
Impaired loans with no related allowance, Interest Income Recognized |  | 371
Impaired loans with an allowance recorded, Recorded Investment | 667 |
Impaired loans with an allowance recorded, Related Allowance | 53 |
Impaired loans with an allowance recorded, Interest Income Recognized | 27 |
Total impaired loans, Recorded Investment | 12,673 | 14,717
Total impaired loans, Interest Income Recognized | 27 | 371
One-to-Four Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 563 | 584
Impaired loans with no related allowance, Interest Income Recognized | 16 | 21
Impaired loans with an allowance recorded, Recorded Investment | 1,143 |
Impaired loans with an allowance recorded, Related Allowance | 199 |
Impaired loans with an allowance recorded, Interest Income Recognized | 10 |
Total impaired loans, Recorded Investment | 1,706 | 584
Total impaired loans, Interest Income Recognized | 26 | 21
Acquisition, Development, and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 389
Impaired loans with no related allowance, Interest Income Recognized |  | 364
Total impaired loans, Recorded Investment |  | 389
Total impaired loans, Interest Income Recognized |  | 364
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 26,613 | 37,669
Impaired loans with no related allowance, Interest Income Recognized | 676 | 2,494
Impaired loans with an allowance recorded, Recorded Investment | 291 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 20 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 10 | 13
Total impaired loans, Recorded Investment | 26,904 | 39,114
Total impaired loans, Interest Income Recognized | $ 686 | $ 2,507

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