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Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment [Line Items]    
Securities available for sale, Amortized Cost $ 113,079 $ 120,311
Securities available for sale, Gross Unrealized Gains 1,276 2,811
Securities available for sale, Gross Unrealized Losses 2,066 149
Securities available for sale, Fair Value 112,289 122,973
Securities held to maturity, Amortized Cost 10 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 10 12
Agency mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 18,377 22,762
Securities available for sale, Gross Unrealized Gains 205 456
Securities available for sale, Gross Unrealized Losses 235 12
Securities available for sale, Fair Value 18,347 23,206
Securities held to maturity, Amortized Cost 10 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 10 12
Agency CMO
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 21,714 22,458
Securities available for sale, Gross Unrealized Gains 115 225
Securities available for sale, Gross Unrealized Losses 307 23
Securities available for sale, Fair Value 21,522 22,660
Agency notes and bonds
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 34,754 38,273
Securities available for sale, Gross Unrealized Gains 82 290
Securities available for sale, Gross Unrealized Losses 557 10
Securities available for sale, Fair Value 34,279 38,553
Municipal Obligations
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 35,757 32,605
Securities available for sale, Gross Unrealized Gains 874 1,800
Securities available for sale, Gross Unrealized Losses 943 88
Securities available for sale, Fair Value 35,688 34,317
Debt Securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 110,602 116,098
Securities available for sale, Gross Unrealized Gains 1,276 2,771
Securities available for sale, Gross Unrealized Losses 2,042 133
Securities available for sale, Fair Value 109,836 118,736
Mutual funds
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 2,477 4,213
Securities available for sale, Gross Unrealized Gains 0 40
Securities available for sale, Gross Unrealized Losses 24 16
Securities available for sale, Fair Value $ 2,453 $ 4,237