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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 850,664 | $ 1,671,447
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 9,253 | 21,770
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 783,381 | 627,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 25,067 | 11,637
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,634,045 | 2,298,992
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 34,320 | 33,407
Debt Securities | U.S. Treasury Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 49,987 | 11,917
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 49,987 | 11,917
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3 |
Debt Securities | GSE Certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 7,415 | 396,930
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 25 | 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 | 7,415 | 404,472
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 25 | 3,763
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 2,579 | 609,502
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 6 | 2,582
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 128,575 | 133,955
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 77 | 959
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 131,154 | 743,457
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 83 | 3,541
Debt Securities | GSE Debentures |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 507,331 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3,640 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 507,331 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3,640 |
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 58,647 | 256,619
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 372 | 10,854
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 366,963 | 116,635
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 9,615 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 425,610 | 373,254
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 9,987 | 10,854
Debt Securities | Municipal Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 9,235 | 9,349
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 113 | 475
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 9,235 | 9,349
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 113 | 475
Debt Securities | Corporate Bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 163,643 | 99,300
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3,962 | 700
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 245,201 | 172,717
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 4,799 | 2,283
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 408,844 | 272,017
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 8,761 | 2,983
Debt Securities | Capital Trust Notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 45,770 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1,244 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 33,407 | 37,525
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 10,463 | 6,306
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 79,177 | 37,525
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 11,707 | 6,306
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 |  | 297,179
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 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 |  | 435,368
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 5,312
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 15,292 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1 |
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 | 15,292 | 11,633
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 1 | $ 173

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