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Investment Securities - Length of Time Individual Securities have been in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Securities
Dec. 31, 2012
Securities
Schedule of Available-for-sale Securities [Line Items]    
Available for sale less than 12 months, Fair value $ 901,145 $ 2,995
Available for sale less than 12 months, Unrealized losses 1,326 3
Available for sale less than 12 months, Number of Securities 44 1
Available for sale more than 12 months, Fair value 0 0
Available for sale more than 12 months, Unrealized losses 0 0
Available for sale more than 12 months, Number of Securities 0 0
U.S. Government Sponsored Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale less than 12 months, Fair value 90,101 2,995
Available for sale less than 12 months, Unrealized losses 1,325 3
Available for sale less than 12 months, Number of Securities 43 1
Available for sale more than 12 months, Fair value 0 0
Available for sale more than 12 months, Unrealized losses 0 0
Available for sale more than 12 months, Number of Securities 0 0
Corporate Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available for sale less than 12 months, Fair value 43  
Available for sale less than 12 months, Unrealized losses 1  
Available for sale less than 12 months, Number of Securities 1  
Available for sale more than 12 months, Fair value 0  
Available for sale more than 12 months, Unrealized losses $ 0  
Available for sale more than 12 months, Number of Securities 0