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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, 2014
Investment
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 18
Number of investment positions in continuous loss position more than twelve months 47
Number of investment positions in continuous loss position 65
Fair value of securities in continuous loss position less than twelve months $ 12,646
Fair value of securities in continuous loss position more than twelve months 36,348
Fair value of securities in continuous loss position 48,994
Gross unrealized losses of securities in continuous loss position less than twelve months 46
Gross unrealized losses of securities in continuous loss position more than twelve months 827
Gross unrealized losses of securities in continuous loss position 873
Agency notes and bonds
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 2
Number of investment positions in continuous loss position more than twelve months 12
Fair value of securities in continuous loss position less than twelve months 1,401
Fair value of securities in continuous loss position more than twelve months 13,396
Gross unrealized losses of securities in continuous loss position less than twelve months 2
Gross unrealized losses of securities in continuous loss position more than twelve months 249
Agency CMO
  
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 10
Fair value of securities in continuous loss position less than twelve months 699
Fair value of securities in continuous loss position more than twelve months 8,604
Gross unrealized losses of securities in continuous loss position less than twelve months 2
Gross unrealized losses of securities in continuous loss position more than twelve months 217
Agency mortgage-backed securities
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 14
Number of investment positions in continuous loss position more than twelve months 6
Fair value of securities in continuous loss position less than twelve months 10,438
Fair value of securities in continuous loss position more than twelve months 6,425
Gross unrealized losses of securities in continuous loss position less than twelve months 41
Gross unrealized losses of securities in continuous loss position more than twelve months 85
Municipal obligations
  
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 18
Fair value of securities in continuous loss position less than twelve months 108
Fair value of securities in continuous loss position more than twelve months 7,517
Gross unrealized losses of securities in continuous loss position less than twelve months 1
Gross unrealized losses of securities in continuous loss position more than twelve months 261
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 406
Gross unrealized losses of securities in continuous loss position more than twelve months $ 15