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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Available-for-Sale Securities:  
Due within one year $ 116,450
Due from one to five years 727,437
Due from five to ten years 2,061,599
Due after ten years 2,947,571
Total securities available for sale 5,853,057
Mortgage-related Securities  
Available-for-Sale Securities:  
Due within one year 60,091
Due from one to five years 497,541
Due from five to ten years 330,095
Due after ten years 2,426,030
Total securities available for sale $ 3,313,757
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.26%
Due from one to five years, Average Yield 3.37%
Due from five to ten years, Average Yield 3.22%
Due after ten years, Average Yield 2.85%
Total securities available for sale, Average Yield 2.97%
U.S. Treasury and GSE Obligations  
Available-for-Sale Securities:  
Due within one year $ 41,820
Due from one to five years 32,874
Due from five to ten years 939,971
Due after ten years 121,000
Total securities available for sale $ 1,135,665
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 1.77%
Due from one to five years, Average Yield 3.48%
Due from five to ten years, Average Yield 3.01%
Due after ten years, Average Yield 2.83%
Total securities available for sale, Average Yield 2.96%
State, county, and municipal  
Available-for-Sale Securities:  
Due within one year $ 148
Due from five to ten years 20,773
Due after ten years 5,887
Total securities available for sale $ 26,808
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 6.66% [1]
Due from five to ten years, Average Yield 3.49% [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 Securities:  
Due within one year $ 13,982 [2]
Due from one to five years 179,566 [2]
Due from five to ten years 749,871 [2]
Due after ten years 389,984 [2]
Total securities available for sale $ 1,333,403 [2]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 3.79%
Due from one to five years, Average Yield 3.28%
Due from five to ten years, Average Yield 3.22%
Due after ten years, Average Yield 2.67%
Total securities available for sale, Average Yield 3.07%
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, and asset-backed securities.