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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, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  |  | $ 36,385
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  |  | 1,049
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  |  | 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  |  | 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  |  | 41,626
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  |  | 3,266
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | [1] |  | 16,190
Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | $ 895,352 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 4,347 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 108,144 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 10,099 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 1,003,496 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 14,446 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 581,856
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 4,318
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value |  |  | 24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss |  |  | 11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 606,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 16,190
Debt Securities | GSE certificates |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 232,546 | 7,326
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 535 | 460
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 20,440 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 664 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 252,986 | 7,326
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 1,199 | 460
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 268,891
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 2,399
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 268,891
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 2,399
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 |  | 118,694 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 826 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 118,694 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 826 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 42,980
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 57
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 42,980
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 57
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 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 200,220
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 73
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 200,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 73
Debt Securities | Municipal bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  | 11,169 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  | 259 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 41,054 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 542 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 52,223 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 801 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 69,765
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 1,789
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 69,765
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 1,789
Debt Securities | Capital trust notes |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 35,105 | 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 8,632 | 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 35,105 | 5,241
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | 8,632 | 2,217
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value |  |  | 24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss |  |  | 11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 24,364
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 11,872
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  |  | 29,059
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  |  | 589
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value |  | 11,545 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss |  | 261 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  | 11,545 | 29,059
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  | $ 261 | $ 589
[1] | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).

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