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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
Dec. 31, 2016
Dec. 31, 2015
 [2]
Held-to-Maturity Securities:    
Carrying Amount $ 3,712,776 [1] $ 5,969,390
Held-to-Maturity Securities:    
Due within one year 200,220  
Due from one to five years 802,256  
Due from five to ten years 2,350,628  
Due after ten years 460,855  
Total securities held to maturity 3,813,959 [1] $ 6,108,529
Available-for-Sale Securities:    
Due within one year [3] 155  
Due from one to five years [3] 476  
Due from five to ten years [3] 7,326  
Due after ten years [3] 7,243  
Total securities available for sale [3] 15,200  
Mortgage-Related Securities    
Held-to-Maturity Securities:    
Due from one to five years 648,801  
Due from five to ten years 2,233,393  
Due after ten years 330,369  
Carrying Amount 3,212,563  
Available-for-Sale Securities:    
Due from five to ten years [3] 7,786  
Total securities available for sale [3] $ 7,786  
Held-to-Maturity Securities, Average Yield    
Due from one to five years, Average Yield 3.68%  
Due from five to ten years, Average Yield 3.10%  
Due after ten years, Average Yield 2.96%  
Total securities held to maturity, Average Yield 3.20%  
Available-for-Sale Securities, Average Yield    
Due from five to ten years, Average Yield [3] 1.90%  
Total securities available for sale, Average Yield [3] 1.90%  
U.S. Treasury and GSE Obligations    
Held-to-Maturity Securities:    
Due within one year $ 200,293  
Due from one to five years 66,534  
Due from five to ten years 21,923  
Carrying Amount $ 288,750  
Held-to-Maturity Securities, Average Yield    
Due within one year, Average Yield 0.60%  
Due from one to five years, Average Yield 4.14%  
Due from five to ten years, Average Yield 3.52%  
Total securities held to maturity, Average Yield 1.64%  
State, county, and municipal    
Held-to-Maturity Securities:    
Due after ten years $ 71,554  
Carrying Amount 71,554  
Available-for-Sale Securities:    
Due within one year [3] 149  
Due from one to five years [3] 434  
Total securities available for sale [3] $ 583  
Held-to-Maturity Securities, Average Yield    
Due after ten years, Average Yield [4] 2.88%  
Total securities held to maturity, Average Yield [4] 2.88%  
Available-for-Sale Securities, Average Yield    
Due within one year, Average Yield [3],[4] 6.47%  
Due from one to five years, Average Yield [3],[4] 6.59%  
Total securities available for sale, Average Yield [3],[4] 6.56%  
Other Debt Securities    
Held-to-Maturity Securities:    
Due from one to five years [5] $ 48,064  
Due from five to ten years [5] 26,153  
Due after ten years [5] 65,692  
Carrying Amount [5] 139,909  
Available-for-Sale Securities:    
Due after ten years [3],[5] 9,458  
Total securities available for sale [3],[5] $ 9,458  
Held-to-Maturity Securities, Average Yield    
Due from one to five years, Average Yield 3.34%  
Due from five to ten years, Average Yield 9.06%  
Due after ten years, Average Yield 4.73%  
Total securities held to maturity, Average Yield 5.06%  
Available-for-Sale Securities, Average Yield    
Due after ten years, Average Yield [3] 4.66%  
Total securities available for sale, Average Yield [3] 4.66%  
[1] 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, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[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 (before taxes).
[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.