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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 22,634 | $ 56,936
Impaired loans with no related allowance, Interest Income Recognized | 841 | 3,516
Impaired loans with an allowance recorded, Recorded Investment | 15,151 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 1,110 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 99 | 13
Total impaired loans, Recorded Investment | 37,785 | 58,381
Total impaired loans, Interest Income Recognized | 940 | 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 | 589 |
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 | 2,256 | 14,717
Impaired loans with no related allowance, Interest Income Recognized |  | 371
Impaired loans with an allowance recorded, Recorded Investment | 9,886 |
Impaired loans with an allowance recorded, Related Allowance | 133 |
Impaired loans with an allowance recorded, Interest Income Recognized | 52 |
Total impaired loans, Recorded Investment | 12,142 | 14,717
Total impaired loans, Interest Income Recognized | 52 | 371
One-to-Four Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 557 | 584
Impaired loans with no related allowance, Interest Income Recognized | 21 | 21
Impaired loans with an allowance recorded, Recorded Investment | 1,139 |
Impaired loans with an allowance recorded, Related Allowance | 370 |
Impaired loans with an allowance recorded, Interest Income Recognized | 14 |
Total impaired loans, Recorded Investment | 1,696 | 584
Total impaired loans, Interest Income Recognized | 35 | 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 | 19,821 | 37,669
Impaired loans with no related allowance, Interest Income Recognized | 820 | 2,494
Impaired loans with an allowance recorded, Recorded Investment | 58 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 18 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 5 | 13
Total impaired loans, Recorded Investment | 19,879 | 39,114
Total impaired loans, Interest Income Recognized | $ 825 | $ 2,507

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