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Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Available-for-Sale Securities:  
Due within one year $ 259,617 [1]
Due from one to five years 963,589 [1]
Due from five to ten years 1,361,457 [1]
Due after ten years 914,230 [1]
Total securities available for sale 3,498,893 [1]
Mortgage-Related Securities  
Available-for-Sale Securities:  
Due from one to five years 883,138 [2]
Due from five to ten years 1,002,205 [1]
Due after ten years 674,618 [1]
Total securities available for sale $ 2,559,961 [1]
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.32% [1]
Due from five to ten years, Average Yield 3.44% [1]
Due after ten years, Average Yield 3.09% [1]
Total securities available for sale, Average Yield 3.30% [1]
U.S. Treasury and GSE Obligations  
Available-for-Sale Securities:  
Due within one year $ 259,256 [2]
Due from one to five years 6,950 [2]
Due from five to ten years 283,883 [1]
Due after ten years 123,750 [1]
Total securities available for sale $ 673,839 [1]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 1.82% [1]
Due from one to five years, Average Yield 3.84% [1]
Due from five to ten years, Average Yield 3.08% [1]
Due after ten years, Average Yield 3.23% [1]
Total securities available for sale, Average Yield 3.22% [1]
State, county, and municipal  
Available-for-Sale Securities:  
Due within one year $ 148 [2]
Due from one to five years 291 [2]
Due after ten years 69,942 [1]
Total securities available for sale $ 70,381 [1]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 6.51% [1],[3]
Due from one to five years, Average Yield 6.63% [1],[3]
Due after ten years, Average Yield 2.88% [1],[3]
Total securities available for sale, Average Yield 2.90% [1],[3]
Other Debt Securities  
Available-for-Sale Securities:  
Due from one to five years $ 48,449 [2]
Due from five to ten years 31,253 [1]
Due after ten years 48,230 [1]
Total securities available for sale $ 127,932 [1]
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.57% [1]
Due from five to ten years, Average Yield 8.37% [1]
Due after ten years, Average Yield 3.77% [1]
Total securities available for sale, Average Yield 4.82% [1]
[1] As equity securities have no contractual maturity, they have been excluded from this table.
[2] (3) As equity securities have no contractual maturity, they have been excluded from this table.
[3] Not presented on a tax-equivalent basis.