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Investment Securities - Length of Time Individual Securities have been in Continuous Unrealized Loss Position (Detail) (USD $)
Share data in Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available for sale less than 12 months, Fair value $ 102,623,000 $ 2,995,000
Available for sale less than 12 months, Unrealized losses 1,796,000 3,000
Available for sale less than 12 months, Number of Securities 48 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 102,623,000 2,995,000
Available for sale less than 12 months, Unrealized losses 1,796,000 3,000
Available for sale less than 12 months, Number of Securities 48 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