Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Loans	$ 4,944	$ 4,626	$ 9,783	$ 9,124
Investment securities - taxable	134us-gaap_InterestIncomeSecuritiesTaxable	167us-gaap_InterestIncomeSecuritiesTaxable	277us-gaap_InterestIncomeSecuritiesTaxable	333us-gaap_InterestIncomeSecuritiesTaxable
Mortgage-backed securities	741	644	1,446	1,294
Investment securities - tax exempt	580	508	1,132	1,018
Interest bearing deposits and federal funds sold	8	6	10	8
Total interest income	6,407	5,951	12,648	11,777
Interest expense:
Interest on deposits	500us-gaap_InterestExpenseDeposits	549us-gaap_InterestExpenseDeposits	1,001us-gaap_InterestExpenseDeposits	1,099us-gaap_InterestExpenseDeposits
Interest on borrowings	63us-gaap_InterestExpenseBorrowings	33us-gaap_InterestExpenseBorrowings	124us-gaap_InterestExpenseBorrowings	61us-gaap_InterestExpenseBorrowings
Total interest expense	563us-gaap_InterestExpense	582us-gaap_InterestExpense	1,125us-gaap_InterestExpense	1,160us-gaap_InterestExpense
Net interest income	5,844us-gaap_InterestIncomeExpenseNet	5,369us-gaap_InterestIncomeExpenseNet	11,523us-gaap_InterestIncomeExpenseNet	10,617us-gaap_InterestIncomeExpenseNet
Provision for loan losses	305us-gaap_ProvisionForLoanAndLeaseLosses	508us-gaap_ProvisionForLoanAndLeaseLosses	716us-gaap_ProvisionForLoanAndLeaseLosses	821us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	5,539	4,861	10,807	9,796
Noninterest income:
Service charges on deposit accounts	730	655	1,446	1,331
Debit card fees	429us-gaap_FeesAndCommissionsDebitCards	386us-gaap_FeesAndCommissionsDebitCards	844us-gaap_FeesAndCommissionsDebitCards	775us-gaap_FeesAndCommissionsDebitCards
Investment services	87	87	189	192
E-commerce fees	25us-gaap_MerchantDiscountFees	25us-gaap_MerchantDiscountFees	53us-gaap_MerchantDiscountFees	51us-gaap_MerchantDiscountFees
Other operating income	169us-gaap_OtherOperatingIncome	163us-gaap_OtherOperatingIncome	377us-gaap_OtherOperatingIncome	317us-gaap_OtherOperatingIncome
Total noninterest income	1,440us-gaap_NoninterestIncome	1,316us-gaap_NoninterestIncome	2,909us-gaap_NoninterestIncome	2,666us-gaap_NoninterestIncome
Noninterest expense:
Salaries and employee benefits	2,390us-gaap_LaborAndRelatedExpense	2,063us-gaap_LaborAndRelatedExpense	4,757us-gaap_LaborAndRelatedExpense	4,257us-gaap_LaborAndRelatedExpense
Occupancy expense	344us-gaap_OccupancyNet	296us-gaap_OccupancyNet	668us-gaap_OccupancyNet	619us-gaap_OccupancyNet
Equipment and furniture expense	177us-gaap_EquipmentExpense	149us-gaap_EquipmentExpense	253us-gaap_EquipmentExpense	262us-gaap_EquipmentExpense
Service and data processing fees	388	318	842	654
Computer software, supplies and support	106gcbc_ComputerSoftwareSuppliesAndSupport	93gcbc_ComputerSoftwareSuppliesAndSupport	339gcbc_ComputerSoftwareSuppliesAndSupport	207gcbc_ComputerSoftwareSuppliesAndSupport
Advertising and promotion	51us-gaap_AdvertisingExpense	69us-gaap_AdvertisingExpense	132us-gaap_AdvertisingExpense	136us-gaap_AdvertisingExpense
FDIC insurance premiums	101	103	192	192
Legal and professional fees	379us-gaap_ProfessionalFees	250us-gaap_ProfessionalFees	592us-gaap_ProfessionalFees	455us-gaap_ProfessionalFees
Other	560us-gaap_OtherNoninterestExpense	410us-gaap_OtherNoninterestExpense	998us-gaap_OtherNoninterestExpense	781us-gaap_OtherNoninterestExpense
Total noninterest expense	4,496us-gaap_NoninterestExpense	3,751us-gaap_NoninterestExpense	8,773us-gaap_NoninterestExpense	7,563us-gaap_NoninterestExpense
Income before provision for income taxes	2,483	2,426	4,943	4,899
Provision for income taxes	672us-gaap_IncomeTaxExpenseBenefit	701us-gaap_IncomeTaxExpenseBenefit	1,357us-gaap_IncomeTaxExpenseBenefit	1,420us-gaap_IncomeTaxExpenseBenefit
Net income	$ 1,811us-gaap_NetIncomeLoss	$ 1,725us-gaap_NetIncomeLoss	$ 3,586us-gaap_NetIncomeLoss	$ 3,479us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share)	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic	$ 0.83us-gaap_EarningsPerShareBasic
Basic average shares outstanding (in shares)	4,217,118	4,203,985	4,215,738	4,199,349
Diluted earnings per share (in dollars per share)	$ 0.43us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted
Diluted average shares outstanding (in shares)	4,248,175	4,240,216	4,246,793	4,237,766
Dividends per share (in dollars per share)	$ 0.180	$ 0.175	$ 0.36	$ 0.35

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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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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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