Consolidated Statements of Income (Unaudited) (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
Interest income:
Loans	$ 4,996	$ 4,666	$ 14,779	$ 13,790
Investment securities - taxable	135us-gaap_InterestIncomeSecuritiesTaxable	161us-gaap_InterestIncomeSecuritiesTaxable	412us-gaap_InterestIncomeSecuritiesTaxable	494us-gaap_InterestIncomeSecuritiesTaxable
Mortgage-backed securities	731	611	2,177	1,905
Investment securities - tax exempt	602	507	1,734	1,525
Interest bearing deposits and federal funds sold	3	9	13	17
Total interest income	6,467	5,954	19,115	17,731
Interest expense:
Interest on deposits	503us-gaap_InterestExpenseDeposits	548us-gaap_InterestExpenseDeposits	1,504us-gaap_InterestExpenseDeposits	1,647us-gaap_InterestExpenseDeposits
Interest on borrowings	76us-gaap_InterestExpenseBorrowings	52us-gaap_InterestExpenseBorrowings	200us-gaap_InterestExpenseBorrowings	113us-gaap_InterestExpenseBorrowings
Total interest expense	579us-gaap_InterestExpense	600us-gaap_InterestExpense	1,704us-gaap_InterestExpense	1,760us-gaap_InterestExpense
Net interest income	5,888us-gaap_InterestIncomeExpenseNet	5,354us-gaap_InterestIncomeExpenseNet	17,411us-gaap_InterestIncomeExpenseNet	15,971us-gaap_InterestIncomeExpenseNet
Provision for loan losses	416us-gaap_ProvisionForLoanAndLeaseLosses	288us-gaap_ProvisionForLoanAndLeaseLosses	1,132us-gaap_ProvisionForLoanAndLeaseLosses	1,109us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	5,472	5,066	16,279	14,862
Noninterest income:
Service charges on deposit accounts	623	585	2,069	1,916
Debit card fees	404us-gaap_FeesAndCommissionsDebitCards	373us-gaap_FeesAndCommissionsDebitCards	1,248us-gaap_FeesAndCommissionsDebitCards	1,148us-gaap_FeesAndCommissionsDebitCards
Investment services	95	110	284	302
E-commerce fees	23us-gaap_MerchantDiscountFees	21us-gaap_MerchantDiscountFees	76us-gaap_MerchantDiscountFees	72us-gaap_MerchantDiscountFees
Other operating income	106us-gaap_OtherOperatingIncome	159us-gaap_OtherOperatingIncome	483us-gaap_OtherOperatingIncome	476us-gaap_OtherOperatingIncome
Total noninterest income	1,251us-gaap_NoninterestIncome	1,248us-gaap_NoninterestIncome	4,160us-gaap_NoninterestIncome	3,914us-gaap_NoninterestIncome
Noninterest expense:
Salaries and employee benefits	2,439us-gaap_LaborAndRelatedExpense	2,509us-gaap_LaborAndRelatedExpense	7,196us-gaap_LaborAndRelatedExpense	6,766us-gaap_LaborAndRelatedExpense
Occupancy expense	458us-gaap_OccupancyNet	371us-gaap_OccupancyNet	1,126us-gaap_OccupancyNet	990us-gaap_OccupancyNet
Equipment and furniture expense	150us-gaap_EquipmentExpense	81us-gaap_EquipmentExpense	403us-gaap_EquipmentExpense	343us-gaap_EquipmentExpense
Service and data processing fees	430	397	1,272	1,051
Computer software, supplies and support	90gcbc_ComputerSoftwareSuppliesAndSupport	100gcbc_ComputerSoftwareSuppliesAndSupport	429gcbc_ComputerSoftwareSuppliesAndSupport	307gcbc_ComputerSoftwareSuppliesAndSupport
Advertising and promotion	88us-gaap_AdvertisingExpense	66us-gaap_AdvertisingExpense	220us-gaap_AdvertisingExpense	202us-gaap_AdvertisingExpense
FDIC insurance premiums	101	88	293	280
Legal and professional fees	208us-gaap_ProfessionalFees	190us-gaap_ProfessionalFees	800us-gaap_ProfessionalFees	645us-gaap_ProfessionalFees
Other	490us-gaap_OtherNoninterestExpense	473us-gaap_OtherNoninterestExpense	1,488us-gaap_OtherNoninterestExpense	1,254us-gaap_OtherNoninterestExpense
Total noninterest expense	4,454us-gaap_NoninterestExpense	4,275us-gaap_NoninterestExpense	13,227us-gaap_NoninterestExpense	11,838us-gaap_NoninterestExpense
Income before provision for income taxes	2,269	2,039	7,212	6,938
Provision for income taxes	485us-gaap_IncomeTaxExpenseBenefit	543us-gaap_IncomeTaxExpenseBenefit	1,842us-gaap_IncomeTaxExpenseBenefit	1,963us-gaap_IncomeTaxExpenseBenefit
Net income	$ 1,784us-gaap_NetIncomeLoss	$ 1,496us-gaap_NetIncomeLoss	$ 5,370us-gaap_NetIncomeLoss	$ 4,975us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share)	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 1.27us-gaap_EarningsPerShareBasic	$ 1.18us-gaap_EarningsPerShareBasic
Basic average shares outstanding (in shares)	4,220,940	4,211,531	4,217,447	4,203,350
Diluted earnings per share (in dollars per share)	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted	$ 1.17us-gaap_EarningsPerShareDiluted
Diluted average shares outstanding (in shares)	4,250,523	4,243,398	4,248,057	4,239,657
Dividends per share (in dollars per share)	$ 0.180	$ 0.175	$ 0.540	$ 0.525

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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