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Loans and Leases - Summary of Financial Effects of Troubled Debt Restructurings (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 USD ($) Investment | Mar. 31, 2020 USD ($) Investment | Dec. 31, 2020 USD ($) Investment | Dec. 31, 2019 USD ($) Investment | Dec. 31, 2018 USD ($) Investment
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 43,000 | 73,000 | 22,000
Pre-Modification Recorded Investment |  |  | $ 24,031,000 | $ 35,287,000 | $ 8,663,000
Post-Modification Recorded Investment |  |  | 22,590,000 | 30,816,000 | 6,355,000
Trouble debt restructuring, charge-off amount |  |  | $ 1,441,000 | 4,471,000 | $ 2,308,000
Capitalized interest |  |  |  | $ 3,000 |
Multi-Family |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 1 |  |  |  |
Pre-Modification Recorded Investment | $ 7,515,000 |  |  |  |
Post-Modification Recorded Investment | $ 7,515,000 |  |  |  |
Weighted Average Interest Rate, Pre-Modification | 3.13% |  |  |  |
Weighted Average Interest Rate, Post-Modification | 3.25% |  |  |  |
Trouble debt restructuring, charge-off amount | $ 0 |  |  |  |
Capitalized interest | $ 0 |  |  |  |
Commercial Real Estate |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 1,000 |  |
Pre-Modification Recorded Investment |  |  | $ 15,119,000 |  |
Post-Modification Recorded Investment |  |  | $ 15,119,000 |  |
Weighted Average Interest Rate, Pre-Modification |  |  | 8.00% |  |
Weighted Average Interest Rate, Post-Modification |  |  | 3.50% |  |
Commercial and Industrial |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 8 | 42,000 | 72,000 | 21,000
Pre-Modification Recorded Investment |  | $ 1,920,000 | $ 8,912,000 | $ 35,156,000 | $ 7,763,000
Post-Modification Recorded Investment |  | $ 1,572,000 | $ 7,471,000 | $ 30,685,000 | $ 5,455,000
Weighted Average Interest Rate, Pre-Modification |  | 3.29% | 2.36% | 4.31% | 3.25%
Weighted Average Interest Rate, Post-Modification |  | 3.24% | 2.23% | 4.37% | 3.13%
Trouble debt restructuring, charge-off amount |  | $ 348,000 | $ 1,441,000 | $ 4,471,000 | $ 2,308,000
Capitalized interest |  | $ 0 |  |  |
One-to-Four Family |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  |  | 1,000 |
Pre-Modification Recorded Investment |  |  |  | $ 131,000 |
Post-Modification Recorded Investment |  |  |  | $ 131,000 |
Weighted Average Interest Rate, Pre-Modification |  |  |  | 5.50% |
Weighted Average Interest Rate, Post-Modification |  |  |  | 5.50% |
Capitalized interest |  |  |  | $ 3,000 |
Acquisition, Development, and Construction |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  |  |  | 1,000
Pre-Modification Recorded Investment |  |  |  |  | $ 900,000
Post-Modification Recorded Investment |  |  |  |  | $ 900,000
Weighted Average Interest Rate, Pre-Modification |  |  |  |  | 4.50%
Weighted Average Interest Rate, Post-Modification |  |  |  |  | 4.50%

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