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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment | $ 27,866 | $ 22,634 | $ 56,936
Impaired loans with no related allowance, Interest Income Recognized | 102 | 841 | 3,516
Impaired loans with an allowance recorded, Recorded Investment | 5,312 | 15,151 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 904 | 1,110 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 6 | 99 | 13
Total impaired loans, Recorded Investment | 33,178 | 37,785 | 58,381
Total impaired loans, Interest Income Recognized | 108 | 940 | 3,529
Multi-Family |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment | 6,840 |  | 3,577
Impaired loans with no related allowance, Interest Income Recognized | 81 |  | 266
Impaired loans with an allowance recorded, Recorded Investment | 3,048 | 4,068 |
Impaired loans with an allowance recorded, Related Allowance | 435 | 589 |
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 28 |
Total impaired loans, Recorded Investment | 9,888 | 4,068 | 3,577
Total impaired loans, Interest Income Recognized | 81 | 28 | 266
Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment | 10,491 | 2,256 | 14,717
Impaired loans with no related allowance, Interest Income Recognized |  |  | 371
Impaired loans with an allowance recorded, Recorded Investment | 1,082 | 9,886 |
Impaired loans with an allowance recorded, Related Allowance | 84 | 133 |
Impaired loans with an allowance recorded, Interest Income Recognized | 2 | 52 |
Total impaired loans, Recorded Investment | 11,573 | 12,142 | 14,717
Total impaired loans, Interest Income Recognized | 2 | 52 | 371
One-to-Four Family |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance, Recorded Investment | 330 | 557 | 584
Impaired loans with no related allowance, Interest Income Recognized | 3 | 21 | 21
Impaired loans with an allowance recorded, Recorded Investment | 1,137 | 1,139 |
Impaired loans with an allowance recorded, Related Allowance | 365 | 370 |
Impaired loans with an allowance recorded, Interest Income Recognized | 3 | 14 |
Total impaired loans, Recorded Investment | 1,467 | 1,696 | 584
Total impaired loans, Interest Income Recognized | 6 | 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 | 10,205 | 19,821 | 37,669
Impaired loans with no related allowance, Interest Income Recognized | 18 | 820 | 2,494
Impaired loans with an allowance recorded, Recorded Investment | 45 | 58 | 1,445
Impaired loans with an allowance recorded, Related Allowance | 20 | 18 | 116
Impaired loans with an allowance recorded, Interest Income Recognized | 1 | 5 | 13
Total impaired loans, Recorded Investment | 10,250 | 19,879 | 39,114
Total impaired loans, Interest Income Recognized | $ 19 | $ 825 | $ 2,507

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