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Stock-Based Compensation - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total intrinsic value of options exercised $ 33,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 157,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue   $ 77,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 307,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Stock options granted (in shares)       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Strike price of phantom stock options as percent of book value (in hundredths) 100.00%gcbc_ShareBasedCompensationArrangementStrikePriceOfStockOptions     100.00%gcbc_ShareBasedCompensationArrangementStrikePriceOfStockOptions    
2011 Phantom Stock Option and Long-term Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted (in shares)       241,090us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
227,330us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
 
Number of shares authorized under the plan (in shares) 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
    1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
  900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
Cash paid on options vested 0gcbc_PaymentForStockOptionsVested
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
0gcbc_PaymentForStockOptionsVested
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
  757,700gcbc_PaymentForStockOptionsVested
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
26,900gcbc_PaymentForStockOptionsVested
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
 
Allocated Share-based Compensation Expense 210,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
  180,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
380,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
339,800us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
 
Total liability for the long-term incentive plan $ 777,900us-gaap_DeferredLongTermLiabilityCharges
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
    $ 777,900us-gaap_DeferredLongTermLiabilityCharges
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member
  $ 1,200,000us-gaap_DeferredLongTermLiabilityCharges
/ us-gaap_PlanNameAxis
= gcbc_PhantomStockOptionAndLongTermIncentivePlan2011Member