The number of financing receivable, excluding accrued interest, of modified during period for debtor experiencing financial difficulty.

No definition available.

+ Details

Name:	ebmt_FinancingReceivableExcludingAccruedInterestModifiedInPeriodNumber
Namespace Prefix:	ebmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ebmt_HomeEquityPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ebmt_OneToFourFamilyLoansMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
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- Details

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- Details

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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ebmt_AgriculturalLoanMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_LoanRestructuringModificationAxis=ebmt_PaymentDeferralAndExtendedMaturityMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityAndInterestRateReductionMember
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Note 3 - Loans Receivable - Schedule of Financing Receivable Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Modified, Amortized cost	$ 220	$ 410	$ 376	$ 1,516
Modified, Number	1	4	2	10
Modified, Number	1	4	2	10
Commercial Real Estate Portfolio Segment [Member] \| Farmland Loan [Member]
Modified, Amortized cost	$ 220		$ 220
Modified, Number	1		1
Modified, Number	1		1
Home Equity Portfolio Segment [Member]
Modified, Amortized cost		$ 260		$ 373
Modified, Number		3		5
Modified, Number		3		5
Residential Portfolio Segment [Member] \| One-to-Four Family Loans [Member]
Modified, Amortized cost				$ 625
Modified, Number				1
Modified, Number				1
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Modified, Amortized cost		$ 150		$ 150
Modified, Number		1		1
Modified, Number		1		1
Commercial Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Modified, Amortized cost				$ 191
Modified, Number				1
Modified, Number				1
Commercial Portfolio Segment [Member] \| Agricultural Loan [Member]
Modified, Amortized cost			$ 156	$ 177
Modified, Number			1	2
Modified, Number			1	2
Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	$ 0	$ 410	$ 156	$ 1,325
Payment Deferral and Extended Maturity [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Farmland Loan [Member]
Modified, Amortized cost	$ 0		$ 0
Total Financing Receivables, Percentage	0.00%		0.00%
Payment Deferral and Extended Maturity [Member] \| Home Equity Portfolio Segment [Member]
Modified, Amortized cost		$ 260		$ 373
Total Financing Receivables, Percentage		0.24%		0.35%
Payment Deferral and Extended Maturity [Member] \| Residential Portfolio Segment [Member] \| One-to-Four Family Loans [Member]
Modified, Amortized cost				$ 625
Total Financing Receivables, Percentage				0.42%
Payment Deferral and Extended Maturity [Member] \| Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Modified, Amortized cost		$ 150		$ 150
Total Financing Receivables, Percentage		0.11%		0.11%
Payment Deferral and Extended Maturity [Member] \| Commercial Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Modified, Amortized cost				$ 0
Total Financing Receivables, Percentage				0.00%
Payment Deferral and Extended Maturity [Member] \| Commercial Portfolio Segment [Member] \| Agricultural Loan [Member]
Modified, Amortized cost			$ 156	$ 177
Total Financing Receivables, Percentage			0.11%	0.11%
Extended Maturity and Interest Rate Reduction [Member]
Modified, Amortized cost	$ 220	$ 0	$ 220	$ 191
Extended Maturity and Interest Rate Reduction [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Farmland Loan [Member]
Modified, Amortized cost	$ 220		$ 220
Total Financing Receivables, Percentage	0.13%		0.13%
Extended Maturity and Interest Rate Reduction [Member] \| Home Equity Portfolio Segment [Member]
Modified, Amortized cost		$ 0		$ 0
Total Financing Receivables, Percentage		0.00%		0.00%
Extended Maturity and Interest Rate Reduction [Member] \| Residential Portfolio Segment [Member] \| One-to-Four Family Loans [Member]
Modified, Amortized cost				$ 0
Total Financing Receivables, Percentage				0.00%
Extended Maturity and Interest Rate Reduction [Member] \| Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Modified, Amortized cost		$ 0		$ 0
Total Financing Receivables, Percentage		0.00%		0.00%
Extended Maturity and Interest Rate Reduction [Member] \| Commercial Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Modified, Amortized cost				$ 191
Total Financing Receivables, Percentage				0.03%
Extended Maturity and Interest Rate Reduction [Member] \| Commercial Portfolio Segment [Member] \| Agricultural Loan [Member]
Modified, Amortized cost			$ 0	$ 0
Total Financing Receivables, Percentage			0.00%	0.00%