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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 1,671,447 | $ 2,054,583
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 18,617 | 40,139
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 627,545 | 759,881
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 14,790 | 22,547
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 2,298,992 | 2,814,464
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 33,407 | 62,686
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 396,930 | 576,970
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3,718 | 10,598
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 7,542 | 232,969
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 45 | 5,363
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 404,472 | 809,939
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3,763 | 15,961
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 609,502 | 465,779
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 2,582 | 1,892
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 133,955 | 99,050
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 959 | 2,348
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 743,457 | 564,829
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3,541 | 4,240
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 debentures |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 297,179 | 276,113
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3,916 | 2,629
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 138,189 | 329,372
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,396 | 6,359
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 435,368 | 605,485
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 5,312 | 8,988
Debt Securities | Municipal bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 5,876
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 21
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 9,349 | 48,837
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 475 | 2,542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 9,349 | 54,713
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 475 | 2,563
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 37,525 | 38,360
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 6,306 | 5,422
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 37,525 | 38,360
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,306 | 5,422
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 256,619 | 69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 7,701 | 430
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 116,635 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 3,154 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 373,254 | 69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 10,855 | 430
Debt Securities | Corporate Bond Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 99,300 | 642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 700 | 23,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 172,717 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,282 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 272,017 | 642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,982 | 23,105
Equity securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 17,836
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 1,464
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 11,633 | 11,293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 173 | 513
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 11,633 | 29,129
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 173 | $ 1,977

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