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Investment Securities Available for Sale with Gross Unrealized Losses Aggregated by Investment Category and Length of Time Individual Investment Securities Have Been in Continuous Position (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Investment
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 66
Number of investment positions in continuous loss position more than twelve months 2
Number of investment positions in continuous loss position 68
Fair value of securities in continuous loss position less than twelve months $ 53,030
Fair value of securities in continuous loss position more than twelve months 643
Fair value of securities in continuous loss position 53,673
Gross unrealized losses of securities in continuous loss position less than twelve months 1,494
Gross unrealized losses of securities in continuous loss position more than twelve months 32
Gross unrealized losses of securities in continuous loss position 1,526
Agency notes and bonds
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 13
Fair value of securities in continuous loss position less than twelve months 14,925
Gross unrealized losses of securities in continuous loss position less than twelve months 298
Agency CMO
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 10
Fair value of securities in continuous loss position less than twelve months 10,643
Gross unrealized losses of securities in continuous loss position less than twelve months 166
Agency mortgage-backed securities
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 15
Fair value of securities in continuous loss position less than twelve months 14,299
Gross unrealized losses of securities in continuous loss position less than twelve months 236
Municipal Obligations
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 27
Number of investment positions in continuous loss position more than twelve months 1
Fair value of securities in continuous loss position less than twelve months 11,635
Fair value of securities in continuous loss position more than twelve months 254
Gross unrealized losses of securities in continuous loss position less than twelve months 779
Gross unrealized losses of securities in continuous loss position more than twelve months 16
Mutual funds
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 1
Number of investment positions in continuous loss position more than twelve months 1
Fair value of securities in continuous loss position less than twelve months 1,528
Fair value of securities in continuous loss position more than twelve months 389
Gross unrealized losses of securities in continuous loss position less than twelve months 15
Gross unrealized losses of securities in continuous loss position more than twelve months $ 16