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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
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.