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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-Sale Securities:    
Due within one year $ 46,495  
Due from one to five years 865,091  
Due from five to ten years 2,071,651  
Due after ten years 2,871,331  
Total securities available for sale 5,854,568 $ 5,613,520
Mortgage-related Securities    
Available-for-Sale Securities:    
Due within one year 2,505  
Due from one to five years 656,530  
Due from five to ten years 345,793  
Due after ten years 2,278,566  
Total securities available for sale $ 3,283,394  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 2.99%  
Due from one to five years, Average Yield 3.29%  
Due from five to ten years, Average Yield 3.31%  
Due after ten years, Average Yield 2.96%  
Total securities available for sale, Average Yield 3.06%  
U.S. Treasury and GSE Obligations    
Available-for-Sale Securities:    
Due within one year $ 29,763  
Due from one to five years 32,874  
Due from five to ten years 958,361  
Due after ten years 146,000  
Total securities available for sale $ 1,166,998  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 1.86%  
Due from one to five years, Average Yield 3.48%  
Due from five to ten years, Average Yield 3.18%  
Due after ten years, Average Yield 2.88%  
Total securities available for sale, Average Yield 3.11%  
State, county, and municipal    
Available-for-Sale Securities:    
Due within one year $ 150  
Due from one to five years 148  
Due from five to ten years 10,957  
Due after ten years 16,064  
Total securities available for sale $ 27,319  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield [1] 6.59%  
Due from one to five years, Average Yield [1] 6.66%  
Due from five to ten years, Average Yield [1] 3.79%  
Due after ten years, Average Yield [1] 3.22%  
Total securities available for sale, Average Yield [1] 3.49%  
Other Debt Securities    
Available-for-Sale Securities:    
Due within one year [2] $ 13,973  
Due from one to five years [2] 154,424  
Due from five to ten years [2] 734,124  
Due after ten years [2] 413,827  
Total securities available for sale [2] $ 1,316,348  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 3.79%  
Due from one to five years, Average Yield 3.42%  
Due from five to ten years, Average Yield 4.19%  
Due after ten years, Average Yield 2.91%  
Total securities available for sale, Average Yield 3.69%  
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, and asset-backed securities.