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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available-for-Sale Securities:    
Due within one year $ 29,815  
Due from one to five years 941,396  
Due from five to ten years 2,345,797  
Due after ten years 2,407,636  
Total securities available for sale 5,724,644 $ 5,613,520
Mortgage-Related Securities    
Available-for-Sale Securities:    
Due within one year 0  
Due from one to five years 797,756  
Due from five to ten years 325,241  
Due after ten years 1,705,436  
Total securities available for sale $ 2,828,433  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 8212.00%  
Due from one to five years, Average Yield 3.33%  
Due from five to ten years, Average Yield 3.46%  
Due after ten years, Average Yield 3.23%  
Total securities available for sale, Average Yield 3.28%  
U.S. Treasury and GSE Obligations    
Available-for-Sale Securities:    
Due within one year $ 29,659  
Due from one to five years 32,874  
Due from five to ten years 1,232,053  
Due after ten years 213,850  
Total securities available for sale $ 1,508,436  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 2.45%  
Due from one to five years, Average Yield 3.48%  
Due from five to ten years, Average Yield 3.44%  
Due after ten years, Average Yield 3.57%  
Total securities available for sale, Average Yield 3.44%  
State, county, and municipal    
Available-for-Sale Securities:    
Due within one year $ 149  
Due from one to five years 146  
Due from five to ten years 10,974  
Due after ten years 57,008  
Total securities available for sale $ 68,277  
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] 2.71%  
Total securities available for sale, Average Yield [1] 2.90%  
Other Debt Securities    
Available-for-Sale Securities:    
Due within one year [2] $ 0  
Due from one to five years [2] 92,939  
Due from five to ten years [2] 767,143  
Due after ten years [2] 433,938  
Total securities available for sale [2] $ 1,294,020  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield 8212.00%  
Due from one to five years, Average Yield 3.79%  
Due from five to ten years, Average Yield 4.42%  
Due after ten years, Average Yield 3.39%  
Total securities available for sale, Average Yield 4.03%  
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, and asset-backed securities.