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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 2,610,084 | $ 1,095,548 | $ 1,671,447
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 133,490 | 9,868 | 18,617
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 542,998 | 725,998 | 627,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 16,871 | 19,829 | 14,790
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 3,153,082 | 1,821,546 | 2,298,992
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 150,361 | 29,697 | 33,407
Debt Securities | U.S. Government and GSE obligations |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 58,876 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 136 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 58,876 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 136 |
Debt Securities | U. S. Treasury Obligations |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  |  | 11,917
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  |  | 11,917
Debt Securities | GSE Certificates |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 323,281 | 58,876 | 396,930
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 14,901 | 136 | 3,718
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  |  | 7,542
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  |  | 45
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 323,281 | 58,876 | 404,472
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 14,901 | 136 | 3,763
Debt Securities | GSE CMOs |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 918,257 | 442,207 | 609,502
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 50,422 | 2,807 | 2,582
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 73,568 | 133,955
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 65 | 959
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 918,257 | 515,775 | 743,457
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 50,422 | 2,872 | 3,541
Debt Securities | GSE Debentures |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 1,244,721 | 522,441 | 297,179
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 67,633 | 3,949 | 3,916
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  |  | 138,189
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  |  | 1,396
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,244,721 | 522,441 | 435,368
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 67,633 | 3,949 | 5,312
Debt Securities | Asset-backed Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 112,149 |  | 256,619
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 405 |  | 7,701
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 179,063 | 363,618 | 116,635
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,962 | 5,703 | 3,154
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 291,212 | 363,618 | 373,254
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3,367 | 5,703 | 10,855
Debt Securities | Municipal Bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 8,744 | 8,891 | 9,349
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 186 | 90 | 475
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 8,744 | 8,891 | 9,349
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 186 | 90 | 475
Debt Securities | Corporate Bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 72,024 | 99,300
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 2,976 | 700
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 319,590 | 246,528 | 172,717
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 5,410 | 3,471 | 2,282
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 319,590 | 318,552 | 272,017
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 5,410 | 6,447 | 2,982
Debt Securities | Capital Trust Notes |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 35,601 | 33,393 | 37,525
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8,313 | 10,500 | 6,306
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 35,601 | 33,393 | 37,525
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 8,313 | $ 10,500 | 6,306
Equity Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 11,676 |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 129 |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  |  | 11,633
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  |  | 173
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 11,676 |  | 11,633
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 129 |  | $ 173

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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