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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail) $ in Thousands | Dec. 31, 2019 USD ($)
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Available-for-Sale Securities: |  |
Due within one year | $ 116,450 |
Due from one to five years | 727,437 |
Due from five to ten years | 2,061,599 |
Due after ten years | 2,947,571 |
Total securities available for sale | 5,853,057 |
Mortgage-related Securities |  |
Available-for-Sale Securities: |  |
Due within one year | 60,091 |
Due from one to five years | 497,541 |
Due from five to ten years | 330,095 |
Due after ten years | 2,426,030 |
Total securities available for sale | $ 3,313,757 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 3.26% |
Due from one to five years, Average Yield | 3.37% |
Due from five to ten years, Average Yield | 3.22% |
Due after ten years, Average Yield | 2.85% |
Total securities available for sale, Average Yield | 2.97% |
U.S. Treasury and GSE Obligations |  |
Available-for-Sale Securities: |  |
Due within one year | $ 41,820 |
Due from one to five years | 32,874 |
Due from five to ten years | 939,971 |
Due after ten years | 121,000 |
Total securities available for sale | $ 1,135,665 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 1.77% |
Due from one to five years, Average Yield | 3.48% |
Due from five to ten years, Average Yield | 3.01% |
Due after ten years, Average Yield | 2.83% |
Total securities available for sale, Average Yield | 2.96% |
State, county, and municipal |  |
Available-for-Sale Securities: |  |
Due within one year | $ 148 |
Due from five to ten years | 20,773 |
Due after ten years | 5,887 |
Total securities available for sale | $ 26,808 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 6.66% | [1]
Due from five to ten years, Average Yield | 3.49% | [1]
Due after ten years, Average Yield | 3.33% | [1]
Total securities available for sale, Average Yield | 3.47% | [1]
Other Debt Securities |  |
Available-for-Sale Securities: |  |
Due within one year | $ 13,982 | [2]
Due from one to five years | 179,566 | [2]
Due from five to ten years | 749,871 | [2]
Due after ten years | 389,984 | [2]
Total securities available for sale | $ 1,333,403 | [2]
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 3.79% |
Due from one to five years, Average Yield | 3.28% |
Due from five to ten years, Average Yield | 3.22% |
Due after ten years, Average Yield | 2.67% |
Total securities available for sale, Average Yield | 3.07% |
[1] | Not presented on a tax-equivalent basis.
[2] | Includes corporate bonds, capital trust notes, and asset-backed securities.

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