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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
 12 Months Ended
Dec. 31, 2013
Investment
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 81
Number of investment positions in continuous loss position more than twelve months 9
Number of investment positions in continuous loss position 90
Fair value of securities in continuous loss position less than twelve months $ 61,528
Fair value of securities in continuous loss position more than twelve months 5,261
Fair value of securities in continuous loss position 66,789
Gross unrealized losses of securities in continuous loss position less than twelve months 1,970
Gross unrealized losses of securities in continuous loss position more than twelve months 322
Gross unrealized losses of securities in continuous loss position 2,292
Agency mortgage-backed securities
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 15
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 12,975
Fair value of securities in continuous loss position less than twelve months 1,788
Gross unrealized losses of securities in continuous loss position less than twelve months 161
Gross unrealized losses of securities in continuous loss position more than twelve months 83
Agency CMO
  
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 1
Fair value of securities in continuous loss position less than twelve months 12,577
Fair value of securities in continuous loss position more than twelve months 720
Gross unrealized losses of securities in continuous loss position less than twelve months 307
Gross unrealized losses of securities in continuous loss position more than twelve months 34
Agency notes and bonds
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 21
Fair value of securities in continuous loss position less than twelve months 21,952
Gross unrealized losses of securities in continuous loss position less than twelve months 729
Municipal obligations
  
Investments, Unrealized Loss Position [Line Items]  
Number of investment positions in continuous loss position less than twelve months 30
Number of investment positions in continuous loss position more than twelve months 5
Fair value of securities in continuous loss position less than twelve months 12,487
Fair value of securities in continuous loss position more than twelve months 2,353
Gross unrealized losses of securities in continuous loss position less than twelve months 746
Gross unrealized losses of securities in continuous loss position more than twelve months 192
Mutual fund investment
  
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 1,537
Fair value of securities in continuous loss position more than twelve months 400
Gross unrealized losses of securities in continuous loss position less than twelve months 27
Gross unrealized losses of securities in continuous loss position more than twelve months $ 13