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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Available-for-Sale Debt Securities: |  |  |
Due within one year | $ 149,348 | $ 176,720 |
Due from one to five years | 637,035 | 615,048 |
Due from five to ten years | 1,146,853 | 1,130,037 |
Due after ten years | 4,244,669 | 3,891,528 |
Total debt securities available for sale | 6,177,905 | 5,813,333 |
Mortgage-Related Securities |  |  |
Available-for-Sale Debt Securities: |  |  |
Due within one year | 23,017 | 49,797 |
Due from one to five years | 361,118 | 405,157 |
Due from five to ten years | 175,554 | 175,689 |
Due after ten years | 2,631,912 | 2,311,689 |
Total debt securities available for sale | $ 3,191,601 | $ 2,942,332 |
Available-for-Sale Securities, Average Yield |  |  |
Due within one year, Average Yield | 3.76% | 3.03% |
Due from one to five years, Average Yield | 3.18% | 3.16% |
Due from five to ten years, Average Yield | 2.48% | 2.48% |
Due after ten years, Average Yield | 1.98% | 2.15% |
Total securities available for sale, Average Yield | 2.16% | 2.32% |
U.S. Government and GSE obligations |  |  |
Available-for-Sale Debt Securities: |  |  |
Due within one year | $ 75,943 | $ 75,934 |
Due from one to five years | 21,924 | 21,924 |
Due from five to ten years | 238,052 | 138,053 |
Due after ten years | 1,162,354 | 987,326 |
Total debt securities available for sale | $ 1,498,273 | $ 1,223,237 |
Available-for-Sale Securities, Average Yield |  |  |
Due within one year, Average Yield | 0.54% | 0.56% |
Due from one to five years, Average Yield | 3.52% | 3.52% |
Due from five to ten years, Average Yield | 2.16% | 2.37% |
Due after ten years, Average Yield | 1.53% | 1.60% |
Total securities available for sale, Average Yield | 1.61% | 1.66% |
State, County, and Municipal |  |  |
Available-for-Sale Debt Securities: |  |  |
Due from five to ten years | $ 19,840 | $ 19,898 |
Due after ten years | 5,875 | 5,878 |
Total debt securities available for sale | $ 25,715 | $ 25,776 |
Available-for-Sale Securities, Average Yield |  |  |
Due from five to ten years, Average Yield | 3.51% | 3.51% | [1]
Due after ten years, Average Yield | 3.33% | 3.33% | [1]
Total securities available for sale, Average Yield | 3.47% | 3.47% | [1]
Other Debt Securities |  |  |
Available-for-Sale Debt Securities: |  |  |
Due within one year | $ 49,817 | $ 49,704 | [2]
Due from one to five years | 223,181 | 151,873 | [2]
Due from five to ten years | 706,390 | 779,401 | [2]
Due after ten years | 532,230 | 540,500 | [2]
Total debt securities available for sale | $ 1,511,618 | $ 1,521,478 | [2]
Available-for-Sale Securities, Average Yield |  |  |
Due within one year, Average Yield | 3.01% | 3.02% |
Due from one to five years, Average Yield | 1.87% | 2.22% |
Due from five to ten years, Average Yield | 2.03% | 1.88% |
Due after ten years, Average Yield | 1.25% | 1.29% |
Total securities available for sale, Average Yield | 1.76% | 1.74% |
[1] | Not presented on a tax-equivalent basis.
[2] | Includes corporate bonds, capital trust notes, foreign notes, and asset-backed securities.

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