LOANS - Credit Quality Indicators (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026 USD ($) loan	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) loan	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Loans to customers
Total loans	$ 238,801,000		$ 238,801,000		$ 226,669,000
Current period gross write-offs
Total	(67,000)	$ (40,000)	(235,000)	$ (718,000)
Current period recoveries
Total	2,000	3,000	10,000	7,000
Mortgage loans on real estate
Loans to customers
Total loans	206,723,000		206,723,000		200,077,000
Current period gross write-offs
Total	(63,000)		(172,000)
Current period recoveries
Total			1,000
Mortgage loans on real estate | One-to four-family first lien residential
Loans to customers
2026/2025	3,200,000		3,200,000		2,429,000
2025/2024	2,766,000		2,766,000		2,712,000
2024/2023	3,293,000		3,293,000		10,223,000
2023/2022	8,419,000		8,419,000		16,772,000
2022/2021	15,415,000		15,415,000		10,643,000
Prior	55,798,000		55,798,000		50,227,000
Total loans	88,891,000		88,891,000		93,006,000
Current period gross write-offs
2023/2022			(153,000)
2022/2021			(19,000)
Total			(172,000)
Current period recoveries
2023/2022			1,000
Total			1,000
Current period net write-offs
2023/2022			(152,000)
2022/2021			(19,000)
Total			(171,000)
Mortgage loans on real estate | One-to four-family first lien residential | Pass
Loans to customers
2026/2025	3,102,000		3,102,000		2,384,000
2025/2024	2,766,000		2,766,000		2,712,000
2024/2023	3,293,000		3,293,000		9,936,000
2023/2022	8,124,000		8,124,000		16,704,000
2022/2021	15,243,000		15,243,000		10,643,000
Prior	55,292,000		55,292,000		49,857,000
Total loans	87,820,000		87,820,000		92,236,000
Mortgage loans on real estate | One-to four-family first lien residential | Non-Performing
Loans to customers
2026/2025	98,000		98,000		45,000
2024/2023					287,000
2023/2022	295,000		295,000		68,000
2022/2021	172,000		172,000
Prior	506,000		506,000		370,000
Total loans	1,071,000		1,071,000		770,000
Current period net write-offs
Increase due to downgrading	301,000		301,000
Mortgage loans on real estate | Residential construction
Loans to customers
2026/2025	1,487,000		1,487,000		2,190,000
2025/2024	701,000		701,000		750,000
2023/2022					113,000
2022/2021	109,000		109,000
Prior	128,000		128,000		143,000
Total loans	2,425,000		2,425,000		3,196,000
Mortgage loans on real estate | Residential construction | Pass
Loans to customers
2026/2025	1,487,000		1,487,000		2,190,000
2025/2024	701,000		701,000		750,000
2023/2022					113,000
2022/2021	109,000		109,000
Prior	128,000		128,000		143,000
Total loans	2,425,000		2,425,000		3,196,000
Mortgage loans on real estate | Residential construction | Non-Performing
Loans to customers
Revolving Loans Converted to Term Loans Amortized Cost Basis					32,000
Total loans					32,000
Mortgage loans on real estate | Home equity loans and lines of credit
Loans to customers
2026/2025	556,000		556,000		278,000
2025/2024	249,000		249,000		636,000
2024/2023	416,000		416,000
Prior	55,000		55,000		60,000
Revolving Loans Amortized Cost Basis	18,264,000		18,264,000		14,682,000
Revolving Loans Converted to Term Loans Amortized Cost Basis	439,000		439,000		265,000
Total loans	$ 19,979,000		$ 19,979,000		15,921,000
Current period net write-offs
Number of loans downgraded | loan	1		1
Receivables downgraded			$ 89,000
Number of loans paid off | loan			1
Financing receivable excluding accrued interest			$ 32,000
Mortgage loans on real estate | Home equity loans and lines of credit | Pass
Loans to customers
2026/2025	$ 556,000		556,000		278,000
2025/2024	249,000		249,000		636,000
2024/2023	416,000		416,000
Prior	55,000		55,000		60,000
Revolving Loans Amortized Cost Basis	18,264,000		18,264,000		14,682,000
Revolving Loans Converted to Term Loans Amortized Cost Basis	350,000		350,000		233,000
Total loans	19,890,000		19,890,000		15,889,000
Mortgage loans on real estate | Home equity loans and lines of credit | Non-Performing
Loans to customers
Revolving Loans Converted to Term Loans Amortized Cost Basis	89,000		89,000
Total loans	89,000		89,000
Mortgage loans on real estate | Commercial
Loans to customers
2026/2025	12,878,000		12,878,000		31,612,000
2025/2024	31,412,000		31,412,000		10,484,000
2024/2023	8,968,000		8,968,000		13,730,000
2023/2022	13,279,000		13,279,000		7,331,000
2022/2021	6,329,000		6,329,000		6,581,000
Prior	22,562,000		22,562,000		18,216,000
Total loans	$ 95,428,000		$ 95,428,000		87,954,000
Current period net write-offs
Number of loans upgraded | loan	1		1
Number of loans downgraded | loan	1		1
Receivables downgraded			$ 114,000
Decrease due to upgraded	$ 576,000		576,000
Mortgage loans on real estate | Commercial | Pass
Loans to customers
2026/2025	12,545,000		12,545,000		31,612,000
2025/2024	31,412,000		31,412,000		8,687,000
2024/2023	7,756,000		7,756,000		12,995,000
2023/2022	12,544,000		12,544,000		7,331,000
2022/2021	6,215,000		6,215,000		6,581,000
Prior	21,043,000		21,043,000		16,919,000
Total loans	91,515,000		91,515,000		84,125,000
Mortgage loans on real estate | Commercial | Special Mention
Loans to customers
2025/2024					576,000
Prior	565,000		565,000
Total loans	565,000		565,000		576,000
Mortgage loans on real estate | Commercial | Substandard
Loans to customers
2026/2025	333,000		333,000
2025/2024					1,221,000
2024/2023	1,212,000		1,212,000		735,000
2023/2022	735,000		735,000
2022/2021	114,000		114,000
Prior	954,000		954,000		1,297,000
Total loans	3,348,000		3,348,000		3,253,000
Commercial and industrial
Loans to customers
2026/2025	8,633,000		8,633,000		8,210,000
2025/2024	7,816,000		7,816,000		4,907,000
2024/2023	4,467,000		4,467,000		3,354,000
2023/2022	2,544,000		2,544,000		1,920,000
2022/2021	1,175,000		1,175,000		1,554,000
Prior	4,143,000		4,143,000		2,298,000
Total loans	28,778,000		28,778,000		22,243,000
Current period gross write-offs
2024/2023					(652,000)
2023/2022					(7,000)
2022/2021					(4,000)
Prior			(1,000)		(16,000)
Total	(1,000)	(24,000)	(1,000)	(679,000)	(679,000)
Current period recoveries
Prior			1,000		2,000
Total			1,000	2,000	2,000
Current period net write-offs
2024/2023					(652,000)
2023/2022					(7,000)
2022/2021					(4,000)
Prior					(14,000)
Total					(677,000)
Commercial and industrial | Pass
Loans to customers
2026/2025	8,633,000		8,633,000		8,179,000
2025/2024	7,816,000		7,816,000		4,619,000
2024/2023	4,320,000		4,320,000		3,260,000
2023/2022	2,544,000		2,544,000		1,827,000
2022/2021	1,175,000		1,175,000		1,554,000
Prior	4,143,000		4,143,000		2,298,000
Total loans	28,631,000		28,631,000		21,737,000
Commercial and industrial | Special Mention
Loans to customers
2026/2025					31,000
2025/2024					288,000
2024/2023					94,000
2023/2022					93,000
Total loans					506,000
Commercial and industrial | Substandard
Loans to customers
2024/2023	147,000		147,000
Total loans	$ 147,000		$ 147,000
Commercial and industrial | Commercial
Current period net write-offs
Number of loans upgraded | loan	7		7
Number of loans downgraded | loan	1		1
Receivables downgraded			$ 147,000
Decrease due to upgraded	$ 506,000		$ 506,000
Commercial and industrial | Commercial | Pass
Current period net write-offs
Number of loans downgraded | loan	2		2
Consumer loans
Loans to customers
2026/2025	$ 349,000		$ 349,000		711,000
2025/2024	499,000		499,000		1,788,000
2024/2023	1,288,000		1,288,000		731,000
2023/2022	391,000		391,000		909,000
2022/2021	89,000		89,000		1,000
Prior	617,000		617,000		116,000
Revolving Loans Amortized Cost Basis	67,000		67,000		92,000
Revolving Loans Converted to Term Loans Amortized Cost Basis					1,000
Total loans	3,300,000		3,300,000		4,349,000
Current period gross write-offs
2026/2025			(9,000)
2025/2024			(33,000)		(28,000)
2024/2023			(11,000)		(9,000)
Prior			(9,000)		(2,000)
Total	(3,000)	(16,000)	(62,000)	(39,000)	(39,000)
Current period recoveries
2025/2024			3,000
2024/2023			4,000		5,000
2023/2022			1,000
Prior					1,000
Total	2,000	$ 3,000	8,000	$ 5,000	6,000
Current period net write-offs
2026/2025			(9,000)
2025/2024			(30,000)		(28,000)
2024/2023			(7,000)		(4,000)
2023/2022			1,000
Prior			(9,000)		(1,000)
Total			(54,000)		(33,000)
Consumer loans | Pass
Loans to customers
2026/2025	349,000		349,000		711,000
2025/2024	489,000		489,000		1,788,000
2024/2023	1,288,000		1,288,000		731,000
2023/2022	389,000		389,000		909,000
2022/2021	89,000		89,000		1,000
Prior	617,000		617,000		116,000
Revolving Loans Amortized Cost Basis	67,000		67,000		92,000
Revolving Loans Converted to Term Loans Amortized Cost Basis					1,000
Total loans	3,288,000		3,288,000		$ 4,349,000
Consumer loans | Non-Performing
Loans to customers
2025/2024	10,000		10,000
2023/2022	2,000		2,000
Total loans	$ 12,000		$ 12,000