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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, 2018 | Dec. 31, 2017
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Debt Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | $ 2,054,583 | $ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 40,139 | 4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 759,881 | 108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 22,547 | 10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 2,814,464 | 1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 62,686 | 14,446
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 576,970 | 232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 10,598 | 535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 232,969 | 20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 5,363 | 664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 809,939 | 252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 15,961 | 1,199
Debt Securities | GSE debentures |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 333,045
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 2,665
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 333,045
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 2,665
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 465,779 | 118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1,892 | 826
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 99,050 | 0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,348 | 0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 564,829 | 118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 4,240 | 826
Debt Securities | U.S. Treasury obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 276,113 | 199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 2,629 | 62
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 329,372 | 0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 6,359 | 0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 605,485 | 199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 8,988 | 62
Debt Securities | Municipal bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 5,876 | 11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 21 | 259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 48,837 | 41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,542 | 542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 54,713 | 52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,563 | 801
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 0 | 0
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 0 | 0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 38,360 | 35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 5,422 | 8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 38,360 | 35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 5,422 | 8,632
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 69,166 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 430 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 0 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 0 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 69,166 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 430 |
Debt Securities | Corporate Bond Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 642,843 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 23,105 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 0 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 0 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 642,843 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 23,105 |
Equity securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 17,836 | 0
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 1,464 | 0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 11,293 | 11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 513 | 261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 29,129 | 11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 1,977 | $ 261

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