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Summary of Carrying Amount and Estimated Fair Value of Held-to-Maturity Debt Securities and Amortized Cost and Estimated Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | [1]
--- | --- | --- | ---
Held-to-Maturity Securities: |  |  |
Carrying Amount |  | $ 3,642,104 | $ 3,712,776
Held-to-Maturity Securities: |  |  |
Due within one year |  | 261,164 |
Due from one to five years |  | 788,750 |
Due from five to ten years |  | 2,258,597 |
Due after ten years |  | 441,538 |
Total securities held to maturity |  | 3,750,049 | $ 3,813,959
Available-for-Sale Securities: |  |  |
Due within one year | [2] | 153 |
Due from one to five years | [2] | 478 |
Due from five to ten years | [2] | 7,303 |
Due after ten years | [2] | 7,417 |
Total securities available for sale | [2] | 15,351 |
Mortgage-Related Securities |  |  |
Held-to-Maturity Securities: |  |  |
Due from one to five years |  | 699,621 |
Due from five to ten years |  | 2,133,551 |
Due after ten years |  | 309,021 |
Carrying Amount |  | 3,142,193 |
Available-for-Sale Securities: |  |  |
Due from five to ten years | [2] | 7,748 |
Total securities available for sale | [2] | $ 7,748 |
Held-to-Maturity Securities, Average Yield |  |  |
Due from one to five years, Average Yield |  | 3.57% |
Due from five to ten years, Average Yield |  | 3.11% |
Due after ten years, Average Yield |  | 2.98% |
Total securities held to maturity, Average Yield |  | 3.20% |
Available-for-Sale Securities, Average Yield |  |  |
Due from five to ten years, Average Yield | [2] | 1.90% |
Total securities available for sale, Average Yield | [2] | 1.90% |
U.S. Treasury and GSE Obligations |  |  |
Held-to-Maturity Securities: |  |  |
Due within one year |  | $ 259,671 |
Due from one to five years |  | 6,950 |
Due from five to ten years |  | 21,924 |
Carrying Amount |  | $ 288,545 |
Held-to-Maturity Securities, Average Yield |  |  |
Due within one year, Average Yield |  | 1.42% |
Due from one to five years, Average Yield |  | 3.84% |
Due from five to ten years, Average Yield |  | 3.52% |
Total securities held to maturity, Average Yield |  | 1.64% |
State, county, and municipal |  |  |
Held-to-Maturity Securities: |  |  |
Due after ten years |  | $ 71,297 |
Carrying Amount |  | 71,297 |
Available-for-Sale Securities: |  |  |
Due within one year | [2] | 149 |
Due from one to five years | [2] | 435 |
Total securities available for sale | [2] | $ 584 |
Held-to-Maturity Securities, Average Yield |  |  |
Due after ten years, Average Yield | [3] | 2.88% |
Total securities held to maturity, Average Yield | [3] | 2.88% |
Available-for-Sale Securities, Average Yield |  |  |
Due within one year, Average Yield | [2],[3] | 6.47% |
Due from one to five years, Average Yield | [2],[3] | 6.59% |
Total securities available for sale, Average Yield | [2],[3] | 6.56% |
Other Debt Securities |  |  |
Held-to-Maturity Securities: |  |  |
Due from one to five years | [4] | $ 48,158 |
Due from five to ten years | [4] | 26,179 |
Due after ten years | [4] | 65,732 |
Carrying Amount | [4] | 140,069 |
Available-for-Sale Securities: |  |  |
Due after ten years | [2],[4] | 9,463 |
Total securities available for sale | [2],[4] | $ 9,463 |
Held-to-Maturity Securities, Average Yield |  |  |
Due from one to five years, Average Yield |  | 3.40% |
Due from five to ten years, Average Yield |  | 9.06% |
Due after ten years, Average Yield |  | 4.78% |
Total securities held to maturity, Average Yield |  | 5.10% |
Available-for-Sale Securities, Average Yield |  |  |
Due after ten years, Average Yield | [2] | 4.70% |
Total securities available for sale, Average Yield | [2] | 4.70% |
[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).
[2] | As equity securities have no contractual maturity, they have been excluded from this table.
[3] | Not presented on a tax-equivalent basis.
[4] | Includes corporate bonds and capital trust notes.

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