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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investment Securities [Line Items]    
Due within one year, Amortized Cost $ 25,081  
Due after one but within five years, Amortized Cost 216,972  
Due after five but within ten years, Amortized Cost 0  
Due after ten years, Amortized Cost 57,778  
Debt securities gross, Amortized Cost 299,831  
Corporate/Mortgage-Backed Securities, Amortized cost 1,297,923 1,169,613
Total Debt Securities, Amortized Cost 1,296,103  
Due within one year, Estimated Fair Value 25,332  
Due after one but within five years, Estimated Fair Value 217,191  
Due after five but within ten years, Estimated Fair Value 0  
Due after ten years, Estimated Fair Value 31,485  
Debt securities gross, Estimated Fair Value 274,008  
Corporate/Mortgage-Backed Securities, Estimated fair value 1,297,203 1,171,303
Total Debt Securities, Estimated Fair Value 1,295,270  
Mortgage Backed Securities [Member]
    
Investment Securities [Line Items]    
Corporate/Mortgage-Backed Securities, Amortized cost 996,272 [1]  
Corporate/Mortgage-Backed Securities, Estimated fair value $ 1,021,262 [1]  
[1] Mortgage Backed Securities include an amortized cost of $26.5 million and a fair value of $30.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac which had an amortized cost of $969.7 million and a fair value of $990.8 million.