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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Available-for-Sale Debt Securities:  
Due within one year $ 149,348
Due from one to five years 637,035
Due from five to ten years 1,146,853
Due after ten years 4,244,669
Total debt securities available for sale 6,177,905
Mortgage-Related Securities  
Available-for-Sale Debt Securities:  
Due within one year 23,017
Due from one to five years 361,118
Due from five to ten years 175,554
Due after ten years 2,631,912
Total debt securities available for sale $ 3,191,601
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.76%
Due from one to five years, Average Yield 3.18%
Due from five to ten years, Average Yield 2.48%
Due after ten years, Average Yield 1.98%
Total securities available for sale, Average Yield 2.16%
U.S. Government and GSE obligations  
Available-for-Sale Debt Securities:  
Due within one year $ 75,943
Due from one to five years 21,924
Due from five to ten years 238,052
Due after ten years 1,162,354
Total debt securities available for sale $ 1,498,273
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 0.54%
Due from one to five years, Average Yield 3.52%
Due from five to ten years, Average Yield 2.16%
Due after ten years, Average Yield 1.53%
Total securities available for sale, Average Yield 1.61%
State, County, and Municipal  
Available-for-Sale Debt Securities:  
Due from five to ten years $ 19,840
Due after ten years 5,875
Total debt securities available for sale $ 25,715
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 $ 49,817 [2]
Due from one to five years 223,181 [2]
Due from five to ten years 706,390 [2]
Due after ten years 532,230 [2]
Total debt securities available for sale $ 1,511,618 [2]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.01%
Due from one to five years, Average Yield 1.87%
Due from five to ten years, Average Yield 2.03%
Due after ten years, Average Yield 1.25%
Total securities available for sale, Average Yield 1.76%
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, and asset-backed securities.