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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, 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 | $ 2,951,905 | $ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 62,383 | 4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 118,623 | 108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 8,524 | 10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 3,070,528 | 1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 70,907 | 14,446
Debt Securities | GSE certificates |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 1,209,277 | 232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 31,983 | 535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 18,248 | 20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,378 | 664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 1,227,525 | 252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 33,361 | 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, 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 | 488,185 | 118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 6,133 | 826
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 488,185 | 118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 6,133 | 826
Debt Securities | U.S. Treasury and GSE Obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 992,186 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 22,868 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 992,186 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 22,868 |
Debt Securities | Municipal bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 5,884 | 11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 14 | 259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 50,082 | 41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 1,863 | 542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 55,966 | 52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 1,877 | 801
Debt Securities | Capital trust notes |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 39,109 | 35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 4,661 | 8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 39,109 | 35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 4,661 | 8,632
Debt Securities | U.S. Treasury obligations |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 62
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 62
Debt Securities | Corporate bonds |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 160,268 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 655 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 160,268 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 655 |
Debt Securities | Asset backed securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 77,000 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 534 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 77,000 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 534 |
Equity securities |  |
Schedule of Investments [Line Items] |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 19,105 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 196 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 11,184 | 11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 622 | 261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 30,289 | 11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 818 | $ 261

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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=82897076&loc=d3e27337-111563 + Details
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