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Summary of Carrying Amount and Estimated Fair Value of Held-to-Maturity Debt Securities and Amortized Cost and Estimated Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
 [2]
Held-to-Maturity Securities:    
Carrying Amount $ 4,068,750 [1] $ 5,969,390
Held-to-Maturity Securities:    
Due within one year 328  
Due from one to five years 452,138  
Due from five to ten years 3,279,755  
Due after ten years 571,940  
Total securities held to maturity 4,304,161 [1] $ 6,108,529
Available-for-Sale Securities:    
Due within one year [3] 154  
Due from one to five years [3] 646  
Due from five to ten years [3] 0  
Due after ten years [3] 6,841  
Total securities available for sale [3] 7,641  
Mortgage-Related Securities    
Held-to-Maturity Securities:    
Due from one to five years 358,897  
Due from five to ten years 2,709,236  
Due after ten years 417,968  
Carrying Amount 3,486,101  
Available-for-Sale Securities:    
Due from five to ten years [3] $ 0  
Held-to-Maturity Securities, Average Yield    
Due from one to five years, Average Yield 3.74%  
Due from five to ten years, Average Yield 3.23%  
Due after ten years, Average Yield 2.93%  
Total securities held to maturity, Average Yield 3.25%  
Available-for-Sale Securities, Average Yield    
Due from five to ten years, Average Yield [3] 0.00%  
U.S. Treasury and GSE Obligations    
Held-to-Maturity Securities:    
Due from one to five years $ 59,792  
Due from five to ten years 308,992  
Carrying Amount 368,784  
Available-for-Sale Securities:    
Due from five to ten years [3] $ 0  
Held-to-Maturity Securities, Average Yield    
Due from one to five years, Average Yield 4.17%  
Due from five to ten years, Average Yield 3.14%  
Total securities held to maturity, Average Yield 3.31%  
Available-for-Sale Securities, Average Yield    
Due from five to ten years, Average Yield [3] 0.00%  
State, county, and municipal    
Held-to-Maturity Securities:    
Due within one year $ 327  
Due after ten years 74,092  
Carrying Amount 74,419  
Available-for-Sale Securities:    
Due within one year [3] 149  
Due from one to five years [3] 578  
Due from five to ten years [3] 0  
Total securities available for sale [3] $ 727  
Held-to-Maturity Securities, Average Yield    
Due within one year, Average Yield [4] 2.96%  
Due after ten years, Average Yield [4] 2.89%  
Total securities held to maturity, Average Yield [4] 2.89%  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield [3],[4] 6.39%  
Due from one to five years, Average Yield [3],[4] 6.56%  
Due from five to ten years, Average Yield [3],[4] 0.00%  
Total securities available for sale, Average Yield [3],[4] 6.52%  
Other Debt Securities    
Held-to-Maturity Securities:    
Due from five to ten years [5] $ 64,211  
Due after ten years [5] 75,235  
Carrying Amount [5] 139,446  
Available-for-Sale Securities:    
Due from five to ten years [3],[5] 0  
Due after ten years [3],[5] 9,448  
Total securities available for sale [3],[5] $ 9,448  
Held-to-Maturity Securities, Average Yield    
Due from five to ten years, Average Yield 4.74%  
Due after ten years, Average Yield 5.14%  
Total securities held to maturity, Average Yield 4.96%  
Available-for-Sale Securities, Average Yield    
Due from five to ten years, Average Yield [3] 0.00%  
Due after ten years, Average Yield [3] 4.46%  
Total securities available for sale, Average Yield [3] 4.46%  
[1] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in Accumulated Other Comprehensive Loss ("AOCL"). At March 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[2] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[3] As equity securities have no contractual maturity, they have been excluded from this table.
[4] Not presented on a tax-equivalent basis.
[5] Includes corporate bonds and capital trust notes