Loans Receivable and the Allowance for Loan Losses - Allowance (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Allowance for Loan Losses:
Beginning Balance	$ 850,000	$ 850,000
Recoveries	8,000	2,000
Provision		(2,000)
Ending Balance	858,000	850,000
Ending Balance: Collectively Evaluated for Impairment	858,000	850,000
Loans Receivable: Ending Balance	73,904,000	69,603,000
Ending Balance: Collectively Evaluated for Impairment	73,904,000	69,603,000
Allowance for loan losses, unallocated portion	858,000	850,000
Loan balances outstanding on non-accrual status	0	0
Mortgage - 1-4 Family
Allowance for Loan Losses:
Beginning Balance	818,000	805,000
Recoveries	8,000	2,000
Provision	(53,000)	11,000
Ending Balance	773,000	818,000
Ending Balance: Collectively Evaluated for Impairment	773,000	818,000
Loans Receivable: Ending Balance	66,312,000	64,792,000
Ending Balance: Collectively Evaluated for Impairment	66,312,000	64,792,000
Allowance for loan losses, unallocated portion	773,000	818,000
Mortgage - Multifamily
Allowance for Loan Losses:
Beginning Balance	22,000	27,000
Provision	(1,000)	(5,000)
Ending Balance	21,000	22,000
Ending Balance: Collectively Evaluated for Impairment	21,000	22,000
Loans Receivable: Ending Balance	2,800,000	2,877,000
Ending Balance: Collectively Evaluated for Impairment	2,800,000	2,877,000
Allowance for loan losses, unallocated portion	21,000	22,000
Mortgage - Construction and Land
Allowance for Loan Losses:
Beginning Balance	6,000	7,000
Provision	36,000	(1,000)
Ending Balance	42,000	6,000
Ending Balance: Collectively Evaluated for Impairment	42,000	6,000
Loans Receivable: Ending Balance	3,101,000	1,356,000
Ending Balance: Collectively Evaluated for Impairment	3,101,000	1,356,000
Allowance for loan losses, unallocated portion	42,000	6,000
Mortgage - Commercial real estate
Allowance for Loan Losses:
Beginning Balance	4,000	11,000
Provision	18,000	(7,000)
Ending Balance	22,000	4,000
Ending Balance: Collectively Evaluated for Impairment	22,000	4,000
Loans Receivable: Ending Balance	1,492,000	364,000
Ending Balance: Collectively Evaluated for Impairment	1,492,000	364,000
Allowance for loan losses, unallocated portion	22,000	4,000
Consumer Loans
Allowance for Loan Losses:
Loans Receivable: Ending Balance	199,000	214,000
Ending Balance: Collectively Evaluated for Impairment	199,000	214,000
Unallocated finance receivable
Allowance for Loan Losses:
Beginning Balance	495,000
Ending Balance	497,000	495,000
Allowance for loan losses, unallocated portion	$ 497,000	$ 495,000
Maximum
Allowance for Loan Losses:
Stressed debt service coverage ratio	1.20

Eureka Homestead Bancorp, Inc. 10-Q