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Summary of Amortized Cost of Securities by Contractual Maturity (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
 [1]
Available-for-Sale Securities:  
Due within one year $ 199,581
Due from one to five years 1,019,714
Due from five to ten years 1,257,619
Due after ten years 915,038
Total securities available for sale 3,391,952
Mortgage-Related Securities  
Available-for-Sale Securities:  
Due from one to five years 950,910
Due from five to ten years 864,803
Due after ten years 688,384
Total securities available for sale $ 2,504,097
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.37%
Due from five to ten years, Average Yield 3.35%
Due after ten years, Average Yield 3.09%
Total securities available for sale, Average Yield 3.29%
U.S. Treasury and GSE Obligations  
Available-for-Sale Securities:  
Due within one year $ 199,678
Due from one to five years 6,950
Due from five to ten years 347,888
Due after ten years 123,750
Total securities available for sale $ 678,266
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 1.70%
Due from one to five years, Average Yield 3.84%
Due from five to ten years, Average Yield 3.16%
Due after ten years, Average Yield 3.23%
Total securities available for sale, Average Yield 2.75%
State, county, and municipal  
Available-for-Sale Securities:  
Due within one year $ 149
Due from one to five years 292
Due after ten years 69,676
Total securities available for sale $ 70,117
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 6.51% [2]
Due from one to five years, Average Yield 6.63% [2]
Due after ten years, Average Yield 2.88% [2]
Total securities available for sale, Average Yield 2.90% [2]
Other Debt Securities  
Available-for-Sale Securities:  
Due from one to five years $ 48,548 [3]
Due from five to ten years 31,280 [3]
Due after ten years 48,242 [3]
Total securities available for sale $ 128,070 [3]
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.74%
Due from five to ten years, Average Yield 8.37%
Due after ten years, Average Yield 4.02%
Total securities available for sale, Average Yield 4.98%
[1] 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.