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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
Dec. 31, 2012
Investment
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 21
Number of investment positions in continuous loss position more than twelve months 2
Number of investment positions in continuous loss position 23
Fair value of securities in continuous loss position less than twelve months $ 17,528
Fair value of securities in continuous loss position more than twelve months 1,266
Fair value of securities in continuous loss position 18,794
Gross unrealized losses of securities in continuous loss position less than twelve months 132
Gross unrealized losses of securities in continuous loss position more than twelve months 17
Gross unrealized losses of securities in continuous loss position 149
Agency mortgage-backed securities
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 2
Fair value of securities in continuous loss position less than twelve months 3,070
Gross unrealized losses of securities in continuous loss position less than twelve months 12
Agency CMO
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 6
Fair value of securities in continuous loss position less than twelve months 6,783
Gross unrealized losses of securities in continuous loss position less than twelve months 22
Agency Collateralized Mortgage Obligations
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 3
Fair value of securities in continuous loss position less than twelve months 2,958
Gross unrealized losses of securities in continuous loss position less than twelve months 10
Municipal Obligations
  
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 4,717
Gross unrealized losses of securities in continuous loss position less than twelve months 88
Collateralized Mortgage Obligations Issued By Private Enterprise
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position more than twelve months 1
Fair value of securities in continuous loss position more than twelve months 886
Gross unrealized losses of securities in continuous loss position more than twelve months 1
Mutual fund investment
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position more than twelve months 1
Fair value of securities in continuous loss position more than twelve months 380
Gross unrealized losses of securities in continuous loss position more than twelve months $ 16