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Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Loss [Abstract]    
Unrealized (loss) gain on available for sale securities, net of tax $ 838us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 416us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Unrealized loss on securities transferred to held to maturity, net of tax (41)gcbc_AccumulatedOtherComprehensiveIncomeLossUnrealizedLossOnSecuritiesTransferredToHeldToMaturityNetOfTax (231)gcbc_AccumulatedOtherComprehensiveIncomeLossUnrealizedLossOnSecuritiesTransferredToHeldToMaturityNetOfTax
Net losses and past service liability for defined benefit plan, net of tax (1,235)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (1,235)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive loss $ (438)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,050)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax