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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Investment Securities [Line Items]    
Due within 1 year, Amortized Cost $ 2,601  
Due after 1 but within 5 years, Amortized Cost 16,600  
Due after 5 but within 10 years, Amortized Cost 27,066  
Due after 10 years, Amortized Cost 44,136  
Debt securities gross, Amortized Cost 90,403  
Amortized Cost 891,111 $ 1,317,318
Total debt securities, Amortized Cost 888,941  
Due within 1 year, Estimated Fair Value 2,595  
Due after 1 but within 5 years, Estimated Fair Value 16,523  
Due after 5 but within 10 years, Estimated Fair Value 27,598  
Due after 10 years, Estimated Fair Value 37,977  
Debt securities gross, Estimated Fair Value 84,693  
Estimated Fair Value of Available for Sale 886,560 $ 1,309,819
Total debt securities, Estimated Fair Value 884,390  
Mortgage-Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost [1] 798,538  
Estimated Fair Value of Available for Sale [1] $ 799,697  
[1] Mortgage Backed Securities include an amortized cost of $20.0 million and a fair value of $22.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $778.5 million and a fair value of $777.6 million