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Summary of Carrying Amount of Available-for-Sale Securities by Contractual Maturity (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
 [1]
Available-for-Sale Securities:  
Due within one year $ 260,589
Due from one to five years 972,669
Due from five to ten years 1,562,656
Due after ten years 342,619
Total securities available for sale 3,138,533
Mortgage-Related Securities  
Available-for-Sale Securities:  
Due from one to five years 879,036
Due from five to ten years 1,458,818
Due after ten years 202,318
Total securities available for sale $ 2,540,172
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.34%
Due from five to ten years, Average Yield 3.15%
Due after ten years, Average Yield 3.07%
Total securities available for sale, Average Yield 3.21%
U.S. Treasury and GSE Obligations  
Available-for-Sale Securities:  
Due within one year $ 259,463
Due from one to five years 6,950
Due from five to ten years 21,923
Total securities available for sale $ 288,336
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 1.42%
Due from one to five years, Average Yield 3.84%
Due from five to ten years, Average Yield 3.52%
Total securities available for sale, Average Yield 1.64%
State, county, and municipal  
Available-for-Sale Securities:  
Due within one year $ 149
Due from one to five years 437
Due after ten years 70,753
Total securities available for sale $ 71,339
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 6.47% [2]
Due from one to five years, Average Yield 6.59% [2]
Due after ten years, Average Yield 2.88% [2]
Total securities available for sale, Average Yield 2.91% [2]
Other Debt Securities  
Available-for-Sale Securities:  
Due from one to five years $ 48,254 [3]
Due from five to ten years 26,202 [3]
Due after ten years 75,206 [3]
Total securities available for sale $ 149,662 [3]
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.46%
Due from five to ten years, Average Yield 9.06%
Due after ten years, Average Yield 4.80%
Total securities available for sale, Average Yield 5.11%
[1] (3) As equity securities have no contractual maturity, they have been excluded from this table.
[2] Not presented on a tax-equivalent basis.
[3] (2) Includes corporate bonds and capital trust notes.