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Summary of Carrying Amount of Available-for-Sale Securities by Contractual Maturity (Detail) $ in Thousands | Jun. 30, 2017 USD ($) | [1]
--- | --- | ---
Available-for-Sale Securities: |  |
Due within one year | $ 260,589 |
Due from one to five years | 972,669 |
Due from five to ten years | 1,562,656 |
Due after ten years | 342,619 |
Total securities available for sale | 3,138,533 |
Mortgage-Related Securities |  |
Available-for-Sale Securities: |  |
Due from one to five years | 879,036 |
Due from five to ten years | 1,458,818 |
Due after ten years | 202,318 |
Total securities available for sale | $ 2,540,172 |
Available-for-Sale Securities, Average Yield |  |
Due from one to five years, Average Yield | 3.34% |
Due from five to ten years, Average Yield | 3.15% |
Due after ten years, Average Yield | 3.07% |
Total securities available for sale, Average Yield | 3.21% |
U.S. Treasury and GSE Obligations |  |
Available-for-Sale Securities: |  |
Due within one year | $ 259,463 |
Due from one to five years | 6,950 |
Due from five to ten years | 21,923 |
Total securities available for sale | $ 288,336 |
Available-for-Sale 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 available for sale, Average Yield | 1.64% |
State, county, and municipal |  |
Available-for-Sale Securities: |  |
Due within one year | $ 149 |
Due from one to five years | 437 |
Due after ten years | 70,753 |
Total securities available for sale | $ 71,339 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 6.47% | [2]
Due from one to five years, Average Yield | 6.59% | [2]
Due after ten years, Average Yield | 2.88% | [2]
Total securities available for sale, Average Yield | 2.91% | [2]
Other Debt Securities |  |
Available-for-Sale Securities: |  |
Due from one to five years | $ 48,254 | [3]
Due from five to ten years | 26,202 | [3]
Due after ten years | 75,206 | [3]
Total securities available for sale | $ 149,662 | [3]
Available-for-Sale Securities, Average Yield |  |
Due from one to five years, Average Yield | 3.46% |
Due from five to ten years, Average Yield | 9.06% |
Due after ten years, Average Yield | 4.80% |
Total securities available for sale, Average Yield | 5.11% |
[1] | (3) As equity securities have no contractual maturity, they have been excluded from this table.
[2] | Not presented on a tax-equivalent basis.
[3] | (2) Includes corporate bonds and capital trust notes.

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