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Loans and Leases - Information Regarding Troubled Debt Restructurings (Details) - Non-Covered Loans - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | $ 32,198 | $ 34,285 |  | $ 40,499 |
Accruing |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 14,894 | 14,967 |  | 1,254 |
Non-Accrual |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 17,304 | 19,318 |  | 39,245 |
Multi-Family |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 6,840 |  |  | 3,577 |
Multi-Family | Non-Accrual |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 6,840 |  |  | 3,577 |
Commercial Real Estate |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 14,894 | 14,967 |  |  |
Commercial Real Estate | Accruing |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 14,894 | 14,967 |  |  |
One-to-Four Family |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 330 | 557 |  | 584 |
One-to-Four Family | Non-Accrual |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 330 | 557 |  | 584 |
Acquisition, Development, and Construction |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  |  |  |  | 389 |
Acquisition, Development, and Construction | Accruing |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  |  |  |  | 389 |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | 10,134 | 18,761 | [1] | 35,949 | [1]
Commercial and Industrial | Accruing |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings | [1] |  |  |  | 865 |
Commercial and Industrial | Non-Accrual |  |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |  |
Troubled debt restructurings |  | $ 10,134 | $ 18,761 | [1] | $ 35,084 | [1]
[1] | Includes $17.5 million and $27.3 million of taxi medallion-related loans at December 31, 2020 and 2019, respectively.

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