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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, 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 | $ 1,681,483 | $ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 25,716 | 4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 108,748 | 108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 9,160 | 10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,790,231 | 1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 34,876 | 14,446
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 876,096 | 232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 14,756 | 535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 19,848 | 20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,108 | 664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 895,944 | 252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 15,864 | 1,199
Debt Securities | GSE debentures |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 378,983 | 333,045
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 6,732 | 2,665
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 378,983 | 333,045
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,732 | 2,665
Debt Securities | GSE CMOs |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 199,397 | 118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 3,459 | 826
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 199,397 | 118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 3,459 | 826
Debt Securities | U.S. Treasury obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 199,430 | 199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 248 | 62
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 199,430 | 199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 248 | 62
Debt Securities | Municipal bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 10,901 | 11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 469 | 259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 40,156 | 41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,242 | 542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 51,057 | 52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1,711 | 801
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 37,385 | 35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 6,363 | 8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 37,385 | 35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,363 | 8,632
Equity securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 16,676 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 52 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 11,359 | 11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 447 | 261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 28,035 | 11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 499 | $ 261

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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