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Summary of Amortized Cost of Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-Sale Debt Securities:    
Due within one year [1] $ 199,846  
Due from one to five years [1] 1,283,154  
Due from five to ten years [1] 1,359,372  
Due after ten years [1] 1,280,511  
Total debt securities available for sale 4,122,883 [1] $ 3,531,427
Mortgage-Related Securities    
Available-for-Sale Debt Securities:    
Due from one to five years [1] 1,219,407  
Due from five to ten years [1] 557,628  
Due after ten years [1] 818,349  
Total debt securities available for sale [1] $ 2,595,384  
Available-for-Sale Debt Securities:    
Due from one to five years, Average Yield [1] 3.34%  
Due from five to ten years, Average Yield [1] 3.39%  
Due after ten years, Average Yield [1] 2.94%  
Total debt securities available for sale [1] 3.22%  
U.S. Treasury and GSE Obligations    
Available-for-Sale Debt Securities:    
Due within one year [1] $ 199,839  
Due from one to five years [1] 6,950  
Due from five to ten years [1] 471,325  
Due after ten years [1] 84,591  
Total debt securities available for sale [1] $ 762,705  
Available-for-Sale Debt Securities:    
Due within one year, Average Yield [1] 1.70%  
Due from one to five years, Average Yield [1] 3.84%  
Due from five to ten years, Average Yield [1] 3.11%  
Due after ten years, Average Yield [1] 3.09%  
Total debt securities available for sale [1] 2.74%  
State, county, and municipal    
Available-for-Sale Debt Securities:    
Due within one year [1] $ 149  
Due from one to five years [1] 293  
Due after ten years [1] 69,104  
Total debt securities available for sale [1] $ 69,546  
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] $ 48,648  
Due from five to ten years [1],[3] 330,421  
Due after ten years [1],[3] 329,007  
Total debt securities available for sale [1],[3] $ 708,076  
Available-for-Sale Debt Securities:    
Due from one to five years, Average Yield [1] 3.86%  
Due from five to ten years, Average Yield [1] 3.98%  
Due after ten years, Average Yield [1] 3.24%  
Total debt securities available for sale [1] 3.63%  
[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.