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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 | Jun. 30, 2016 | Dec. 31, 2015 | [2]
--- | --- | --- | ---
Held-to-Maturity Securities: |  |  |  |
Carrying Amount |  | $ 3,822,561 | [1] | $ 5,969,390
Held-to-Maturity Securities: |  |  |  |
Due within one year |  | 219 |  |
Due from one to five years |  | 676,824 |  |
Due from five to ten years |  | 2,867,505 |  |
Due after ten years |  | 549,186 |  |
Total securities held to maturity |  | 4,093,734 | [1] | $ 6,108,529
Available-for-Sale Securities: |  |  |  |
Due within one year | [3] | 153 |  |
Due from one to five years | [3] | 658 |  |
Due from five to ten years | [3] | 0 |  |
Due after ten years | [3] | 6,793 |  |
Total securities available for sale | [3] | 7,604 |  |
Mortgage-Related Securities |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due from one to five years |  | 555,797 |  |
Due from five to ten years |  | 2,482,830 |  |
Due after ten years |  | 391,180 |  |
Carrying Amount |  | 3,429,807 |  |
Available-for-Sale Securities: |  |  |  |
Due from five to ten years | [3] | $ 0 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due from one to five years, Average Yield |  | 3.76% |  |
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 | [3] | 0.00% |  |
U.S. Treasury and GSE Obligations |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due from one to five years |  | $ 66,673 |  |
Due from five to ten years |  | 112,693 |  |
Carrying Amount |  | 179,366 |  |
Available-for-Sale Securities: |  |  |  |
Due from five to ten years | [3] | $ 0 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due from one to five years, Average Yield |  | 4.14% |  |
Due from five to ten years, Average Yield |  | 3.45% |  |
Total securities held to maturity, Average Yield |  | 3.71% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due from five to ten years, Average Yield | [3] | 0.00% |  |
State, county, and municipal |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due within one year |  | $ 219 |  |
Due after ten years |  | 73,573 |  |
Carrying Amount |  | 73,792 |  |
Available-for-Sale Securities: |  |  |  |
Due within one year | [3] | 149 |  |
Due from one to five years | [3] | 580 |  |
Due from five to ten years | [3] | 0 |  |
Total securities available for sale | [3] | $ 729 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due within one year, Average Yield | [4] | 2.96% |  |
Due after ten years, Average Yield | [4] | 2.89% |  |
Total securities held to maturity, Average Yield | [4] | 2.89% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due within one year, Average Yield | [3],[4] | 6.39% |  |
Due from one to five years, Average Yield | [3],[4] | 6.56% |  |
Due from five to ten years, Average Yield | [3],[4] | 0.00% |  |
Total securities available for sale, Average Yield | [3],[4] | 6.52% |  |
Other Debt Securities |  |  |  |
Held-to-Maturity Securities: |  |  |  |
Due from five to ten years | [5] | $ 64,313 |  |
Due after ten years | [5] | 75,283 |  |
Carrying Amount | [5] | 139,596 |  |
Available-for-Sale Securities: |  |  |  |
Due from five to ten years | [3],[5] | 0 |  |
Due after ten years | [3],[5] | 9,451 |  |
Total securities available for sale | [3],[5] | $ 9,451 |  |
Held-to-Maturity Securities, Average Yield |  |  |  |
Due from five to ten years, Average Yield |  | 4.75% |  |
Due after ten years, Average Yield |  | 5.20% |  |
Total securities held to maturity, Average Yield |  | 4.99% |  |
Available-for-Sale Securities, Average Yield |  |  |  |
Due from five to ten years, Average Yield | [3] | 0.00% |  |
Due after ten years, Average Yield | [3] | 4.48% |  |
Total securities available for sale, Average Yield | [3] | 4.48% |  |
[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 June 30, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 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.
[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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