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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) $ in Thousands | Jun. 30, 2020 USD ($)
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Available-for-Sale Debt Securities: |
Due within one year | $ 179,930
Due from one to five years | 724,999
Due from five to ten years | 1,247,921
Due after ten years | 3,015,332
Total debt securities available for sale | 5,168,182
Mortgage-related Securities |
Available-for-Sale Debt Securities: |
Due within one year | 109,229
Due from one to five years | 462,094
Due from five to ten years | 148,386
Due after ten years | 2,181,920
Total debt securities available for sale | $ 2,901,629
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 3.54%
Due from one to five years, Average Yield | 3.11%
Due from five to ten years, Average Yield | 2.71%
Due after ten years, Average Yield | 2.55%
Total securities available for sale, Average Yield | 2.69%
U.S. Government and GSE obligations |
Available-for-Sale Debt Securities: |
Due within one year | $ 68,888
Due from one to five years | 25,924
Due from five to ten years | 316,056
Due after ten years | 323,171
Total debt securities available for sale | $ 734,039
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 0.99%
Due from one to five years, Average Yield | 3.39%
Due from five to ten years, Average Yield | 3.21%
Due after ten years, Average Yield | 2.15%
Total securities available for sale, Average Yield | 2.54%
State, County, and Municipal |
Available-for-Sale Debt Securities: |
Due within one year | $ 149
Due from five to ten years | 20,334
Due after ten years | 5,883
Total debt securities available for sale | $ 26,366
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 6.66%
Due from five to ten years, Average Yield | 3.50%
Due after ten years, Average Yield | 3.33%
Total securities available for sale, Average Yield | 3.48%
Other Debt Securities |
Available-for-Sale Debt Securities: |
Due from one to five years | $ 196,373
Due from five to ten years | 761,943
Due after ten years | 447,710
Total debt securities available for sale | $ 1,406,026
Available-for-Sale Securities, Average Yield |
Due from one to five years, Average Yield | 3.15%
Due from five to ten years, Average Yield | 2.39%
Due after ten years, Average Yield | 1.41%
Total securities available for sale, Average Yield | 2.18%

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