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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 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 | $ 1,439,788 | $ 2,054,583
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 19,209 | 40,139
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 290,924 | 759,881
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8,443 | 22,547
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,730,712 | 2,814,464
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 27,652 | 62,686
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 165,955 | 576,970
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 334 | 10,598
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 7,866 | 232,969
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 60 | 5,363
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 173,821 | 809,939
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 394 | 15,961
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 395,590 | 465,779
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 959 | 1,892
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 104,844 | 99,050
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 738 | 2,348
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 500,434 | 564,829
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1,697 | 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 | 128,052 | 276,113
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 821 | 2,629
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 118,879 | 329,372
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,182 | 6,359
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 246,931 | 605,485
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,003 | 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 | 9,793 | 48,837
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 382 | 2,542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 9,793 | 54,713
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 382 | 2,563
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 45,999 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 690 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 37,855 | 38,360
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 5,963 | 5,422
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 83,854 | 38,360
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,653 | 5,422
Debt Securities | Asset-backed Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 378,256 | 69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 6,528 | 430
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 378,256 | 69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,528 | 430
Debt Securities | Corporate Bond Securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 325,936 | 642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 9,877 | 23,105
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 325,936 | 642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 9,877 | 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 | 11,687 | 11,293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 118 | 513
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 11,687 | 29,129
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 118 | $ 1,977

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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=118939692&loc=d3e27337-111563 + Details
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