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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 982,071 | $ 1,671,447
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 55,115 | 21,770
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 685,094 | 627,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 64,858 | 11,637
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,667,165 | 2,298,992
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 119,973 | 33,407
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 2,061 | 396,930
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 2 | 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 | 2,061 | 404,472
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2 | 3,763
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 314,957 | 609,502
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 2,795 | 2,582
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 191,806 | 133,955
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 3,018 | 959
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 506,763 | 743,457
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 5,813 | 3,541
Debt Securities | U.S. Treasury obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 9,997 | 11,917
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 9,997 | 11,917
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3 |
Debt Securities | U. S. Government agency 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
Debt Securities | Municipal bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 9,156 | 9,349
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 614 | 475
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 9,156 | 9,349
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 614 | 475
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 42,500 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 4,349 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 33,385 | 37,525
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 10,459 | 6,306
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 75,885 | 37,525
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 14,808 | 6,306
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 124,435 | 256,619
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 7,341 | 10,854
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 230,949 | 116,635
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 20,565 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 355,384 | 373,254
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 27,906 | 10,854
Debt Securities | Corporate Bond Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 473,280 | 99,300
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 40,174 | 700
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 219,798 | 172,717
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 30,202 | 2,283
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 693,078 | 272,017
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 70,376 | 2,983
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 14,841 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 451 |
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 | 14,841 | 11,633
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 451 | $ 173

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