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Investment Securities - Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Investment Holdings [Abstract]    
Investment securities $ 21,953us-gaap_InvestmentsFairValueDisclosure $ 21,481us-gaap_InvestmentsFairValueDisclosure
Cost basis of investment securities 21,955us-gaap_InvestmentOwnedAtCost 21,506us-gaap_InvestmentOwnedAtCost
Net unrealized losses on investment securities $ 2us-gaap_MarketableSecuritiesUnrealizedGainLoss $ 25us-gaap_MarketableSecuritiesUnrealizedGainLoss