XML 56 R44.htm IDEA: XBRL DOCUMENT
v3.26.1

Loans and Allowance for Credit Losses on Loans (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 USD ($) Loan | Mar. 31, 2026 USD ($) Loan | Mar. 31, 2025 Loan | Jun. 30, 2025 USD ($) Loan
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Accrued interest receivable | Accrued interest receivable |  | Accrued interest receivable
Loans on non-accrual |  | $ 3,073,000 | $ 3,073,000 |  | $ 3,060,000
Nonaccrual loans with recent history of delinquency greater than 90 days |  | 1,700,000 | 1,700,000 |  | 1,200,000
Loan repayments |  |  | 763,000 |  |
Charge-offs |  |  | 84,000 |  |
Loans placed into nonperforming status |  |  | 860,000 |  |
Accruing loans delinquent more than 90 days |  | 0 | 0 |  | 0
Threshold principal amount of collateral dependent loans evaluated individually |  | 250,000 | 250,000 |  |
Total | [1],[2] | 1,747,703,000 | 1,747,703,000 |  | 1,627,406,000
Loans evaluated individually, amortized cost basis |  | 915,000 | 915,000 |  | 751,000
Loans evaluated individually, allowance for credit losses on loans |  | $ 472,000 | $ 472,000 |  | 549,000
Loans modified to borrowers experiencing financial difficulty (in Loan) | Loan |  | 0 | 0 |  |
Foreclosed real estate |  | $ 0 | $ 0 |  | 0
Doubtful [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Total |  | 0 | 0 |  | 0
Loss [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Total |  | $ 0 | $ 0 |  | $ 0
Residential Real Estate [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Number of loans in the process of foreclosure (in Loan) | Loan |  | 4 | 4 |  | 3
Loans in the process of foreclosure |  | $ 644,000 | $ 644,000 |  | $ 841,000
Collateral dependent loans evaluated individually, amortized cost basis |  | $ 742,000 | $ 742,000 |  | $ 751,000
Commercial Real Estate Portfolio [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Number of loans in the process of foreclosure (in Loan) | Loan |  |  |  |  | 1
Loans in the process of foreclosure |  |  |  |  | $ 142,000
Commercial Real Estate Portfolio [Member] | Term Extension [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Number of loans in the process of foreclosure (in Loan) | Loan |  |  |  | 1 |
Consumer Portfolio [Member] | Term Extension [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Loans modified to borrowers experiencing financial difficulty (in Loan) | Loan |  |  |  | 1 |
Consumer Portfolio [Member] | Uncollateralized [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Threshold period to charge off loans against allowance for loan losses |  | 90 days | 90 days |  |
Threshold period to charge off overdrawn deposit accounts against allowance for loan losses |  |  | 60 days |  |
Unfunded Commitment [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Allowance for credit losses |  | $ 1,300,000 | $ 1,300,000 |  | 1,800,000
Home Equity Loan [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Collateral dependent loans evaluated individually, amortized cost basis |  | 173,000 | 173,000 |  |
Home Equity Loan [Member] | Consumer Portfolio [Member] |  |  |  |  |
Loans and Allowance for Credit Losses on Loans [Abstract] |  |  |  |  |
Loans on non-accrual |  | 202,000 | 202,000 |  | 30,000
Total |  | $ 41,779,000 | $ 41,779,000 |  | $ 34,103,000
[1] | Loan balances exclude accrued interest receivable of $8.0 million and $7.0 million at March 31, 2026 and June 30, 2025, respectively, which is included in accrued interest receivable in the consolidated statement of financial condition.
[2] | Loan balances include net deferred fees/(costs) of ($490,000) and ($567,000) at March 31, 2026 and June 30, 2025, respectively.

X
- Definition The balance of collateral dependent financing receivables that were individually evaluated at amortized cost basis. + References No definition available. + Details
Name: | gcbc_CollateralDependentFinancingReceivableIndividuallyEvaluatedAmortizedCostBasis
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit losses financing receivable which are individually evaluated. + References No definition available. + Details
Name: | gcbc_FinancingReceivableIndividuallyEvaluatedAllowanceForCreditLosses
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated at amortized cost basis. + References No definition available. + Details
Name: | gcbc_FinancingReceivableIndividuallyEvaluatedAmortizedCostBasis
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans placed into nonperforming status during the period. + References No definition available. + Details
Name: | gcbc_FinancingReceivableLoansPlacedIntoNonperformingStatus
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of financing receivables that have been modified for borrowers experiencing financial difficulty. + References No definition available. + Details
Name: | gcbc_FinancingReceivableModificationsLoansToBorrowersExperiencingFinancialDifficultyNumberOfLoans
Namespace Prefix: | gcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The threshold principal amount of collateral dependent loans evaluated individually. + References No definition available. + Details
Name: | gcbc_FinancingReceivableThresholdPrincipalAmountOfCollateralDependentLoansEvaluatedIndividually
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Refers to the number of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References No definition available. + Details
Name: | gcbc_MortgageLoansInProcessOfForeclosureNumberOfLoans
Namespace Prefix: | gcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of nonaccrual loans charged-off during the period. + References No definition available. + Details
Name: | gcbc_NonaccrualLoansChargeOffs
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of nonaccrual loans repaid during the period. + References No definition available. + Details
Name: | gcbc_NonaccrualLoansRepayments
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents loans that are less than 90 days delinquent as of the reporting date, but have a recent history of delinquency greater than 90 days. + References No definition available. + Details
Name: | gcbc_NonaccrualLoansWithRecentHistoryOfDelinquencyGreaterThan90Days
Namespace Prefix: | gcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Threshold period for overdrawn financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | gcbc_ThresholdPeriodForWriteOffOfFinancingReceivableThatHaveBeenOverdrawn
Namespace Prefix: | gcbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A + Details
Name: | us-gaap_FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 + Details
Name: | us-gaap_FinancingReceivableThresholdPeriodPastDueWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 35 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-35 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477011/948-310-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-13 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph a -Publisher SEC Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11 + Details
Name: | us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_UncollateralizedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |