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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, 2014
Dec. 31, 2013
Mar. 31, 2014
Mortgage Backed Securities [Member]
Mar. 31, 2013
Mortgage Backed Securities [Member]
Mar. 31, 2014
US Government Agencies Residential Mortgage-backed Securities [Member]
Dec. 31, 2013
US Government Agencies Residential Mortgage-backed Securities [Member]
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment Securities [Line Items]              
Due within one year, Amortized Cost $ 5,601            
Due after one but within five years, Amortized Cost 263,570            
Due after five but within ten years, Amortized Cost 3,371            
Due after ten years, Amortized Cost 54,873            
Debt securities gross, Amortized Cost 327,415            
Corporate/Mortgage-Backed Securities, Amortized cost 1,370,681 1,350,466 1,041,846 [1] 1,037,946 [1] 21,648 22,639 1,020,200
Debt Securities, Amortized Cost 1,369,261            
Due within one year, Estimated Fair Value 5,604            
Due after one but within five years, Estimated Fair Value 261,706            
Due after five but within ten years, Estimated Fair Value 3,381            
Due after ten years, Estimated Fair Value 40,982            
Debt securities gross, Estimated Fair Value 311,673            
Total Debt Securities, Estimated Fair Value $ 1,349,619            
[1] Mortgage Backed Securities include an amortized cost of $21.6 million and a fair value of $24.2 million for Obligations of U.S.