LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Allowance by Loan Segment (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	$ 2,157,000	$ 2,162,000	$ 2,162,000
Charged off	(314,000)	(8,000)	(203,000)
Recoveries	23,000		102,000
(Release) provision for credit losses	169,000		96,000
Balance, end of year	2,035,000	2,157,000	2,157,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	21,000		200,000
Individually evaluated for impairment, Related loan balance	176,000		329,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	2,014,000		1,957,000
Collectively evaluated for impairment, Related loan balance	177,774,000		175,978,000
Real Estate Loan
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	21,000		21,000
Real Estate Loan | Construction and Land
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	31,000	44,000	44,000
(Release) provision for credit losses	6,000		(13,000)
Balance, end of year	37,000		31,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	37,000		31,000
Collectively evaluated for impairment, Related loan balance	6,106,000		4,636,000
Real Estate Loan | Farmland
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	18,000	20,000	20,000
(Release) provision for credit losses	(1,000)		(2,000)
Balance, end of year	17,000		18,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	17,000		18,000
Collectively evaluated for impairment, Related loan balance	322,000		325,000
Real Estate Loan | Single-family Residential
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	1,290,000	1,230,000	1,230,000
(Release) provision for credit losses	15,000		60,000
Balance, end of year	1,305,000		1,290,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	21,000		21,000
Individually evaluated for impairment, Related loan balance	35,000		30,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	1,284,000		1,269,000
Collectively evaluated for impairment, Related loan balance	86,033,000		86,857,000
Real Estate Loan | Multi-family
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	96,000	103,000	103,000
(Release) provision for credit losses	(1,000)		(7,000)
Balance, end of year	95,000		96,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	95,000		96,000
Collectively evaluated for impairment, Related loan balance	5,130,000		5,165,000
Real Estate Loan | Commercial
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	190,000	221,000	221,000
Charged off	(299,000)
(Release) provision for credit losses	305,000		(31,000)
Balance, end of year	196,000		190,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	196,000		190,000
Collectively evaluated for impairment, Related loan balance	39,084,000		39,217,000
Commercial and Industrial
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance			179,000
Commercial and Industrial | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	304,000	174,000	174,000
Charged off	(299,000)
(Release) provision for credit losses	(145,000)		130,000
Balance, end of year	159,000		304,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance			179,000
Individually evaluated for impairment, Related loan balance	141,000		299,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	159,000		125,000
Collectively evaluated for impairment, Related loan balance	13,141,000		10,551,000
Commercial and Industrial | SBA guaranty
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	21,000	22,000	22,000
(Release) provision for credit losses			(1,000)
Balance, end of year	21,000		21,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	21,000		21,000
Collectively evaluated for impairment, Related loan balance	5,872,000		5,924,000
Consumer Loans | Consumer
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	30,000	23,000	23,000
Charged off	(13,000)		(79,000)
Recoveries			1,000
(Release) provision for credit losses	20,000		85,000
Balance, end of year	37,000		30,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	37,000		30,000
Collectively evaluated for impairment, Related loan balance	2,399,000		2,039,000
Consumer Loans | Automobile
Financing Receivable, Allowance for Credit Losses
Balance, beginning of year	177,000	$ 325,000	325,000
Charged off	(2,000)		(124,000)
Recoveries	23,000		101,000
(Release) provision for credit losses	(30,000)		(125,000)
Balance, end of year	168,000		177,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	168,000		177,000
Collectively evaluated for impairment, Related loan balance	$ 19,687,000		$ 21,264,000