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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]        
Net Income $ 1,784us-gaap_NetIncomeLoss $ 1,496us-gaap_NetIncomeLoss $ 5,370us-gaap_NetIncomeLoss $ 4,975us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding, Basic (in shares) 4,220,940us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,211,531us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,217,447us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,203,350us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Number of Shares Outstanding Effect of dilutive stock options (in shares) 29,583us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 31,867us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 30,610us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 36,307us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted Average Number of Shares Outstanding, Diluted (in shares) 4,250,523us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 4,243,398us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 4,248,057us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 4,239,657us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share, Basic (in dollars per share) $ 0.42us-gaap_EarningsPerShareBasic $ 0.36us-gaap_EarningsPerShareBasic $ 1.27us-gaap_EarningsPerShareBasic $ 1.18us-gaap_EarningsPerShareBasic
Earnings Per Share, Effect of dilutive stock options (in dollars per share) $ 0gcbc_EarningsPerShareEffectOfDilutiveStockOptions $ (0.01)gcbc_EarningsPerShareEffectOfDilutiveStockOptions $ (0.01)gcbc_EarningsPerShareEffectOfDilutiveStockOptions $ (0.01)gcbc_EarningsPerShareEffectOfDilutiveStockOptions
Earnings per Share, Diluted (in dollars per share) $ 0.42us-gaap_EarningsPerShareDiluted $ 0.35us-gaap_EarningsPerShareDiluted $ 1.26us-gaap_EarningsPerShareDiluted $ 1.17us-gaap_EarningsPerShareDiluted
Antidilutive securities or contracts outstanding (in shares) 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount