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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Available-for-Sale Debt Securities: |
Due within one year | $ 211,500
Due from one to five years | 670,442
Due from five to ten years | 1,128,312
Due after ten years | 3,223,490
Total debt securities available for sale | 5,233,744
Mortgage-related Securities |
Available-for-Sale Debt Securities: |
Due within one year | 90,869
Due from one to five years | 458,644
Due from five to ten years | 148,256
Due after ten years | 1,846,645
Total debt securities available for sale | $ 2,544,414
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 3.46%
Due from one to five years, Average Yield | 3.11%
Due from five to ten years, Average Yield | 2.74%
Due after ten years, Average Yield | 2.51%
Total securities available for sale, Average Yield | 2.67%
U.S. Government and GSE obligations |
Available-for-Sale Debt Securities: |
Due within one year | $ 68,935
Due from one to five years | 25,924
Due from five to ten years | 188,055
Due after ten years | 770,936
Total debt securities available for sale | $ 1,053,850
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 0.48%
Due from one to five years, Average Yield | 3.39%
Due from five to ten years, Average Yield | 2.43%
Due after ten years, Average Yield | 1.63%
Total securities available for sale, Average Yield | 1.74%
State, County, and Municipal |
Available-for-Sale Debt Securities: |
Due within one year | $ 150
Due from five to ten years | 20,274
Due after ten years | 5,880
Total debt securities available for sale | $ 26,304
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 within one year | $ 49,593
Due from one to five years | 146,882
Due from five to ten years | 761,267
Due after ten years | 549,646
Total debt securities available for sale | $ 1,507,388
Available-for-Sale Securities, Average Yield |
Due within one year, Average Yield | 3.65%
Due from one to five years, Average Yield | 2.85%
Due from five to ten years, Average Yield | 2.19%
Due after ten years, Average Yield | 1.39%
Total securities available for sale, Average Yield | 2.01%

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