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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Available-for-Sale Debt Securities:  
Due within one year $ 176,720
Due from one to five years 615,048
Due from five to ten years 1,130,037
Due after ten years 3,891,528
Total debt securities available for sale 5,813,333
Mortgage-Related Securities  
Available-for-Sale Debt Securities:  
Due within one year 49,797
Due from one to five years 405,157
Due from five to ten years 175,689
Due after ten years 2,311,689
Total debt securities available for sale $ 2,942,332
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.03%
Due from one to five years, Average Yield 3.16%
Due from five to ten years, Average Yield 2.48%
Due after ten years, Average Yield 2.15%
Total securities available for sale, Average Yield 2.32%
U.S. Government and GSE obligations  
Available-for-Sale Debt Securities:  
Due within one year $ 75,934
Due from one to five years 21,924
Due from five to ten years 138,053
Due after ten years 987,326
Total debt securities available for sale $ 1,223,237
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 0.56%
Due from one to five years, Average Yield 3.52%
Due from five to ten years, Average Yield 2.37%
Due after ten years, Average Yield 1.60%
Total securities available for sale, Average Yield 1.66%
State, County, and Municipal  
Available-for-Sale Debt Securities:  
Due from five to ten years $ 19,898
Due after ten years 5,878
Total debt securities available for sale $ 25,776
Available-for-Sale Securities, Average Yield  
Due from five to ten years, Average Yield 3.51% [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 Debt Securities:  
Due within one year $ 49,704 [2]
Due from one to five years 151,873 [2]
Due from five to ten years 779,401 [2]
Due after ten years 540,500 [2]
Total debt securities available for sale $ 1,521,478 [2]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.02%
Due from one to five years, Average Yield 2.22%
Due from five to ten years, Average Yield 1.88%
Due after ten years, Average Yield 1.29%
Total securities available for sale, Average Yield 1.74%
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, foreign notes, and asset-backed securities.