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Summary of Amortized Cost of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-Sale Debt Securities:    
Due within one year [1] $ 151  
Due from one to five years [1] 1,463,371  
Due from five to ten years [1] 1,605,017  
Due after ten years [1] 1,695,744  
Total debt securities available for sale 4,764,283 [1] $ 3,531,427
Mortgage-Related Securities    
Available-for-Sale Debt Securities:    
Due from one to five years [1] 1,378,471  
Due from five to ten years [1] 326,275  
Due after ten years [1] 1,106,740  
Total debt securities available for sale [1] $ 2,811,486  
Available-for-Sale Debt Securities:    
Due from one to five years, Average Yield [1] 3.31%  
Due from five to ten years, Average Yield [1] 3.44%  
Due after ten years, Average Yield [1] 3.19%  
Total debt securities available for sale [1] 3.28%  
U.S. Treasury and GSE Obligations    
Available-for-Sale Debt Securities:    
Due from one to five years [1] $ 6,950  
Due from five to ten years [1] 927,006  
Due after ten years [1] 109,971  
Total debt securities available for sale [1] $ 1,043,927  
Available-for-Sale Debt Securities:    
Due from one to five years, Average Yield [1] 3.84%  
Due from five to ten years, Average Yield [1] 3.33%  
Due after ten years, Average Yield [1] 3.68%  
Total debt securities available for sale [1] 3.37%  
State, county, and municipal    
Available-for-Sale Debt Securities:    
Due within one year [1] $ 149  
Due from one to five years [1] 294  
Due after ten years [1] 68,833  
Total debt securities available for sale [1] $ 69,276  
Available-for-Sale Debt Securities:    
Due within one year, Average Yield [1],[2] 6.51%  
Due from one to five years, Average Yield [1],[2] 6.63%  
Due after ten years, Average Yield [1],[2] 2.88%  
Total debt securities available for sale [1],[2] 2.90%  
Other Debt Securities    
Available-for-Sale Debt Securities:    
Due from one to five years [1],[3] $ 78,787  
Due from five to ten years [1],[3] 367,115  
Due after ten years [1],[3] 436,047  
Total debt securities available for sale [1],[3] $ 881,949  
Available-for-Sale Debt Securities:    
Due from one to five years, Average Yield [1] 3.64%  
Due from five to ten years, Average Yield [1] 4.02%  
Due after ten years, Average Yield [1] 3.23%  
Total debt securities available for sale [1] 3.60%  
[1] As equity securities have no contractual maturity, they have been excluded from this table.
[2] Not presented on a tax-equivalent basis.
[3] Includes corporate bonds, capital trust notes, and asset-backed securities.