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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
Sep. 30, 2013
Investment
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 80
Number of investment positions in continuous loss position more than twelve months 4
Number of investment positions in continuous loss position 84
Fair value of securities in continuous loss position less than twelve months $ 62,152
Fair value of securities in continuous loss position more than twelve months 1,757
Fair value of securities in continuous loss position 63,909
Gross unrealized losses of securities in continuous loss position less than twelve months 2,010
Gross unrealized losses of securities in continuous loss position more than twelve months 56
Gross unrealized losses of securities in continuous loss position 2,066
Agency notes and bonds
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 20
Fair value of securities in continuous loss position less than twelve months 22,248
Gross unrealized losses of securities in continuous loss position less than twelve months 557
Agency CMO
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 11
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 10,542
Fair value of securities in continuous loss position more than twelve months 775
Gross unrealized losses of securities in continuous loss position less than twelve months 291
Gross unrealized losses of securities in continuous loss position more than twelve months 16
Agency mortgage-backed securities
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 17
Fair value of securities in continuous loss position less than twelve months 14,413
Gross unrealized losses of securities in continuous loss position less than twelve months 235
Municipal Obligations
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 31
Number of investment positions in continuous loss position more than twelve months 2
Fair value of securities in continuous loss position less than twelve months 13,405
Fair value of securities in continuous loss position more than twelve months 589
Gross unrealized losses of securities in continuous loss position less than twelve months 918
Gross unrealized losses of securities in continuous loss position more than twelve months 25
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 1,544
Fair value of securities in continuous loss position more than twelve months 393
Gross unrealized losses of securities in continuous loss position less than twelve months 9
Gross unrealized losses of securities in continuous loss position more than twelve months $ 15