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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, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | $ 14,053 | [1] | $ 29,331 | [2]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 15,285 |  | 105,702 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 8 |  | 356 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 4,974 |  | 4,997 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,481 |  | 2,448 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 20,259 |  | 110,699 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,489 |  | 2,804 |
Debt Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 923,130 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 6,876 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value | 22,177 |  | 1,201,558 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss | 14,053 |  | 22,455 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 22,177 |  | 2,124,688 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 14,053 |  | 29,331 |
Debt Securities | Capital trust notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 24,601 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 399 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value | 22,177 |  | 20,710 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss | 14,053 |  | 15,501 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value | 22,177 |  | 45,311 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss | 14,053 |  | 15,900 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  |  | 1,968 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  |  | 32 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value | 4,974 |  | 4,997 |
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss | 2,481 |  | 2,448 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 4,974 |  | 6,965 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | 2,481 |  | 2,480 |
Debt Securities | GSE debentures |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 547,484 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 728 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value |  |  | 1,176,949 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss |  |  | 6,840 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 1,724,433 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 7,568 |
Debt Securities | GSE certificates |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 299,019 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 4,608 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value |  |  | 3,899 |
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss |  |  | 114 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 302,918 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 4,722 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value |  |  | 51,959 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss |  |  | 1 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value |  |  | 51,959 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss |  |  | 1 |
Debt Securities | Municipal bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 42,083 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 1,084 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 42,083 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 1,084 |
Debt Securities | GSE CMOs |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value |  |  | 9,943 |
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss |  |  | 57 |
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value |  |  | 9,943 |
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss |  |  | 57 |
Equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value | 15,285 |  | 51,775 |
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss | 8 |  | 323 |
Temporarily Impaired Available-for-Sale Securities, Total Fair Value | 15,285 |  | 51,775 |
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss | $ 8 |  | $ 323 |
[1] | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in Accumulated Other Comprehensive Loss ("AOCL"). At September 30, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million, pre-tax.
[2] | 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, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.

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