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Net Loss or Gain from Sale of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Gross realized gains $ 15us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 223us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses (38)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (178)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net (loss) gain on sale of securities $ (23)us-gaap_GainLossOnSaleOfSecuritiesNet $ 45us-gaap_GainLossOnSaleOfSecuritiesNet