XML 14 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements and Fair Value of Financial Instruments - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, Fair value Disclosure $ 432,338us-gaap_LoansReceivableFairValueDisclosure $ 406,718us-gaap_LoansReceivableFairValueDisclosure
Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, Fair value Disclosure 3,700us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 4,200us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Allowance for loan losses $ 578gcbc_LoansAndLeasesReceivableNonrecurringFairValueRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 $ 721gcbc_LoansAndLeasesReceivableNonrecurringFairValueRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember