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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-Sale Securities: |  |  |
Due within one year |  | $ 153 |
Due from one to five years |  | 1,233,880 |
Due from five to ten years |  | 2,213,968 |
Due after ten years |  | 2,165,519 |
Total securities available for sale |  | 5,613,520 | $ 3,531,427
Mortgage-Related Securities |  |  |
Available-for-Sale Securities: |  |  |
Due within one year |  | 0 |
Due from one to five years |  | 1,093,265 |
Due from five to ten years |  | 328,455 |
Due after ten years |  | 1,532,237 |
Total securities available for sale |  | $ 2,953,957 |
Available-for-Sale Securities, Average Yield |  |  |
Due from one to five years, Average Yield |  | 3.31% |
Due from five to ten years, Average Yield |  | 3.41% |
Due after ten years, Average Yield |  | 3.20% |
Total securities available for sale, Average Yield |  | 3.26% |
U.S. Treasury and GSE Obligations |  |  |
Available-for-Sale Securities: |  |  |
Due within one year |  | $ 0 |
Due from one to five years |  | 32,874 |
Due from five to ten years |  | 1,148,695 |
Due after ten years |  | 152,980 |
Total securities available for sale |  | $ 1,334,549 |
Available-for-Sale Securities, Average Yield |  |  |
Due from one to five years, Average Yield |  | 3.48% |
Due from five to ten years, Average Yield |  | 3.41% |
Due after ten years, Average Yield |  | 3.63% |
Total securities available for sale, Average Yield |  | 3.44% |
State, county, and municipal |  |  |
Available-for-Sale Securities: |  |  |
Due within one year |  | $ 148 |
Due from one to five years |  | 146 |
Due from five to ten years |  | 10,981 |
Due after ten years |  | 57,276 |
Total securities available for sale |  | $ 68,551 |
Available-for-Sale Securities, Average Yield |  |  |
Due within one year, Average Yield | [1] | 6.59% |
Due from one to five years, Average Yield | [1] | 6.66% |
Due from five to ten years, Average Yield | [1] | 3.78% |
Due after ten years, Average Yield | [1] | 2.71% |
Total securities available for sale, Average Yield | [1] | 2.90% |
Other Debt Securities |  |  |
Available-for-Sale Securities: |  |  |
Due within one year | [2] | $ 0 |
Due from one to five years | [2] | 92,830 |
Due from five to ten years | [2] | 743,323 |
Due after ten years | [2] | 435,046 |
Total securities available for sale | [2] | $ 1,271,199 |
Available-for-Sale Securities, Average Yield |  |  |
Due from one to five years, Average Yield |  | 3.75% |
Due from five to ten years, Average Yield |  | 4.34% |
Due after ten years, Average Yield |  | 3.24% |
Total securities available for sale, Average Yield |  | 3.92% |
[1] | Not presented on a tax-equivalent basis.
[2] | Includes corporate bonds, capital trust notes, and asset-backed securities.

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