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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 | Dec. 31, 2016 | Dec. 31, 2015 | [2]
--- | --- | --- | ---
Held-to-Maturity Securities: |  |  |  |
Carrying Amount |  | $ 3,712,776 | [1] | $ 5,969,390
Held-to-Maturity Securities: |  |  |  |
Due within one year |  | 200,220 |  |
Due from one to five years |  | 802,256 |  |
Due from five to ten years |  | 2,350,628 |  |
Due after ten years |  | 460,855 |  |
Total securities held to maturity |  | 3,813,959 | [1] | $ 6,108,529
Available-for-Sale Securities: |  |  |  |
Due within one year | [3] | 155 |  |
Due from one to five years | [3] | 476 |  |
Due from five to ten years | [3] | 7,326 |  |
Due after ten years | [3] | 7,243 |  |
Total securities available for sale | [3] | 15,200 |  |
Mortgage-Related Securities |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due from one to five years |  | 648,801 |  |
Due from five to ten years |  | 2,233,393 |  |
Due after ten years |  | 330,369 |  |
Carrying Amount |  | 3,212,563 |  |
Available-for-Sale Securities: |  |  |  |
Due from five to ten years | [3] | 7,786 |  |
Total securities available for sale | [3] | $ 7,786 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due from one to five years, Average Yield |  | 3.68% |  |
Due from five to ten years, Average Yield |  | 3.10% |  |
Due after ten years, Average Yield |  | 2.96% |  |
Total securities held to maturity, Average Yield |  | 3.20% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due from five to ten years, Average Yield | [3] | 1.90% |  |
Total securities available for sale, Average Yield | [3] | 1.90% |  |
U.S. Treasury and GSE Obligations |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due within one year |  | $ 200,293 |  |
Due from one to five years |  | 66,534 |  |
Due from five to ten years |  | 21,923 |  |
Carrying Amount |  | $ 288,750 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due within one year, Average Yield |  | 0.60% |  |
Due from one to five years, Average Yield |  | 4.14% |  |
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 |  | $ 71,554 |  |
Carrying Amount |  | 71,554 |  |
Available-for-Sale Securities: |  |  |  |
Due within one year | [3] | 149 |  |
Due from one to five years | [3] | 434 |  |
Total securities available for sale | [3] | $ 583 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due after ten years, Average Yield | [4] | 2.88% |  |
Total securities held to maturity, Average Yield | [4] | 2.88% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due within one year, Average Yield | [3],[4] | 6.47% |  |
Due from one to five years, Average Yield | [3],[4] | 6.59% |  |
Total securities available for sale, Average Yield | [3],[4] | 6.56% |  |
Other Debt Securities |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due from one to five years | [5] | $ 48,064 |  |
Due from five to ten years | [5] | 26,153 |  |
Due after ten years | [5] | 65,692 |  |
Carrying Amount | [5] | 139,909 |  |
Available-for-Sale Securities: |  |  |  |
Due after ten years | [3],[5] | 9,458 |  |
Total securities available for sale | [3],[5] | $ 9,458 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due from one to five years, Average Yield |  | 3.34% |  |
Due from five to ten years, Average Yield |  | 9.06% |  |
Due after ten years, Average Yield |  | 4.73% |  |
Total securities held to maturity, Average Yield |  | 5.06% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due after ten years, Average Yield | [3] | 4.66% |  |
Total securities available for sale, Average Yield | [3] | 4.66% |  |
[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] | 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 (before taxes).
[3] | As equity securities have no contractual maturity, they have been excluded from this table.
[4] | Not presented on a tax-equivalent basis.
[5] | Includes corporate bonds and capital trust notes.

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