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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, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | $ 13,070 | $ 16,190 | [1]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 23,324 | 36,385 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 781 | 1,049 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 5,441 | 5,241 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,021 | 2,217 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 28,765 | 41,626 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,802 | 3,266 |
Debt Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 573,148 | 581,856 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 3,174 | 4,318 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value | 26,346 | 24,364 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss | 9,896 | 11,872 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 599,494 | 606,220 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 13,070 | 16,190 |
Debt Securities | GSE certificates |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 236,364 | 268,891 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 1,078 | 2,399 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 236,364 | 268,891 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 1,078 | 2,399 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 7,303 | 7,326 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 445 | 460 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 7,303 | 7,326 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 445 | 460 |
Debt Securities | Capital trust notes |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 24,701 |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 300 |  |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value | 26,346 | 24,364 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss | 9,896 | 11,872 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 51,047 | 24,364 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 10,196 | 11,872 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 1,976 |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 25 |  |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 5,441 | 5,241 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,021 | 2,217 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 7,417 | 5,241 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,046 | 2,217 |
Debt Securities | GSE CMOs |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 65,374 | 42,980 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 219 | 57 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 65,374 | 42,980 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 219 | 57 |
Debt Securities | U.S. Treasury obligations |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 200,055 | 200,220 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 103 | 73 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 200,055 | 200,220 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 103 | 73 |
Debt Securities | Municipal bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value | 46,654 | 69,765 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss | 1,474 | 1,789 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 46,654 | 69,765 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 1,474 | 1,789 |
Equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 14,045 | 29,059 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 311 | 589 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 14,045 | 29,059 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 311 | $ 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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