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Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment [Line Items]    
Securities available for sale, Amortized Cost $ 108,824 $ 109,926
Securities available for sale, Gross Unrealized Gains 1,295 1,128
Securities available for sale, Gross Unrealized Losses 1,526 2,292
Securities available for sale, Fair Value 108,593 108,762
Securities held to maturity, Amortized Cost 8 9
Securities held to maturity, Gross Unrealized Gains 0 0
Securities held to maturity, Gross Unrealized Losses 0 0
Securities held to maturity, Fair Value 8 9
Agency mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 21,792 18,408
Securities available for sale, Gross Unrealized Gains 204 205
Securities available for sale, Gross Unrealized Losses 179 244
Securities available for sale, Fair Value 21,817 18,369
Securities held to maturity, Amortized Cost 8 9
Securities held to maturity, Gross Unrealized Gains 0 0
Securities held to maturity, Gross Unrealized Losses 0 0
Securities held to maturity, Fair Value 8 9
Agency CMO
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 19,231 20,486
Securities available for sale, Gross Unrealized Gains 120 96
Securities available for sale, Gross Unrealized Losses 264 341
Securities available for sale, Fair Value 19,087 20,241
Agency notes and bonds
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 29,959 31,594
Securities available for sale, Gross Unrealized Gains 42 49
Securities available for sale, Gross Unrealized Losses 499 729
Securities available for sale, Fair Value 29,502 30,914
Municipal obligations
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 35,670 36,200
Securities available for sale, Gross Unrealized Gains 929 778
Securities available for sale, Gross Unrealized Losses 553 938
Securities available for sale, Fair Value 36,046 36,040
Debt Securities
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 106,652 106,688
Securities available for sale, Gross Unrealized Gains 1,295 1,128
Securities available for sale, Gross Unrealized Losses 1,495 2,252
Securities available for sale, Fair Value 106,452 105,564
Mutual fund investment
   
Investment [Line Items]    
Securities available for sale, Amortized Cost 2,172 3,238
Securities available for sale, Gross Unrealized Gains 0 0
Securities available for sale, Gross Unrealized Losses 31 40
Securities available for sale, Fair Value $ 2,141 $ 3,198