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Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment [Line Items]    
Securities available for sale, Amortized Cost $ 113,708 $ 120,311
Securities available for sale, Gross Unrealized Gains 1,482 2,811
Securities available for sale, Gross Unrealized Losses 1,526 149
Securities available for sale, Fair Value 113,664 122,973
Securities held to maturity, Amortized Cost 11 12
Securities held to maturity, Gross Unrealized Gains 0 0
Securities held to maturity, Gross Unrealized Losses 0 0
Securities held to maturity, Fair Value 11 12
Agency mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 19,709 22,762
Securities available for sale, Gross Unrealized Gains 231 456
Securities available for sale, Gross Unrealized Losses 236 12
Securities available for sale, Fair Value 19,704 23,206
Securities held to maturity, Amortized Cost 11 12
Securities held to maturity, Gross Unrealized Gains 0 0
Securities held to maturity, Gross Unrealized Losses 0 0
Securities held to maturity, Fair Value 11 12
Agency CMO
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 23,806 22,458
Securities available for sale, Gross Unrealized Gains 150 225
Securities available for sale, Gross Unrealized Losses 166 23
Securities available for sale, Fair Value 23,790 22,660
Agency notes and bonds
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 33,760 38,273
Securities available for sale, Gross Unrealized Gains 121 290
Securities available for sale, Gross Unrealized Losses 298 10
Securities available for sale, Fair Value 33,583 38,553
Municipal Obligations
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 33,828 32,605
Securities available for sale, Gross Unrealized Gains 980 1,800
Securities available for sale, Gross Unrealized Losses 795 88
Securities available for sale, Fair Value 34,013 34,317
Debt Securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 111,103 116,098
Securities available for sale, Gross Unrealized Gains 1,482 2,771
Securities available for sale, Gross Unrealized Losses 1,495 133
Securities available for sale, Fair Value 111,090 118,736
Mutual funds
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 2,605 4,213
Securities available for sale, Gross Unrealized Gains 0 40
Securities available for sale, Gross Unrealized Losses 31 16
Securities available for sale, Fair Value $ 2,574 $ 4,237