LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Allowance by Loan Segment (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			$ 1,476,000	$ 2,066,000	$ 2,066,000
Charged off			(193,000)	(277,000)	(392,000)
Recoveries			526,000		491,000
Provision for loan losses	$ (122,000)	$ (669,000)	(593,000)	(263,000)	689,000
Balance, end of year	2,790,000		2,790,000		1,476,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	10,000		10,000		11,000
Individually evaluated for impairment, Related loan balance	2,161,000		2,161,000		4,664,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	2,780,000		2,780,000		1,465,000
Collectively evaluated for impairment, Related loan balance	222,513,000		222,513,000		249,108,000
ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			1,574,000
Balance, end of year					1,574,000
Real Estate Loan
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	10,000		10,000		11,000
Construction And Land Development [Member] | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			9,000	24,000	24,000
Provision for loan losses			18,000		15,000
Balance, end of year	43,000		43,000		9,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	43,000		43,000		9,000
Collectively evaluated for impairment, Related loan balance	3,662,000		3,662,000		2,553,000
Construction And Land Development [Member] | Real Estate Loan | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			16,000
Balance, end of year					16,000
Farmland | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			2,000	2,000	2,000
Balance, end of year	11,000		11,000		2,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	11,000		11,000		2,000
Collectively evaluated for impairment, Related loan balance	345,000		345,000		350,000
Farmland | Real Estate Loan | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			9,000
Balance, end of year					9,000
Single-family | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			513,000	849,000	849,000
Recoveries			346,000		266,000
Provision for loan losses			(544,000)		602,000
Balance, end of year	1,169,000		1,169,000		513,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	10,000		10,000		11,000
Individually evaluated for impairment, Related loan balance	37,000		37,000		132,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	1,159,000		1,159,000		513,000
Collectively evaluated for impairment, Related loan balance	79,012,000		79,012,000		82,388,000
Single-family | Real Estate Loan | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			854,000
Balance, end of year					854,000
Multi-family | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			39,000	40,000	40,000
Provision for loan losses			3,000		1,000
Balance, end of year	105,000		105,000		39,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	105,000		105,000		39,000
Collectively evaluated for impairment, Related loan balance	5,846,000		5,846,000		6,105,000
Multi-family | Real Estate Loan | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			63,000
Balance, end of year					63,000
Commercial and industrial | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			67,000	69,000	69,000
Recoveries					20,000
Provision for loan losses			(21,000)		22,000
Balance, end of year	166,000		166,000		67,000
Individually evaluated for impairment:
Individually evaluated for impairment, Related loan balance					4,493,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	166,000		166,000		67,000
Collectively evaluated for impairment, Related loan balance	10,078,000		10,078,000		6,307,000
Commercial and industrial | Commercial and Industrial | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			120,000
Balance, end of year					120,000
Commercial | Real Estate Loan
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			218,000	241,000	241,000
Provision for loan losses			11,000		23,000
Balance, end of year	428,000		428,000		218,000
Individually evaluated for impairment:
Individually evaluated for impairment, Related loan balance	2,124,000		2,124,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	428,000		428,000		218,000
Collectively evaluated for impairment, Related loan balance	53,036,000		53,036,000		57,027,000
Commercial | Real Estate Loan | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			199,000
Balance, end of year					199,000
SBA Guaranty | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			48,000	25,000	25,000
Provision for loan losses			(3,000)		(23,000)
Balance, end of year	39,000		39,000		48,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	39,000		39,000		48,000
Collectively evaluated for impairment, Related loan balance	6,930,000		6,930,000		7,200,000
SBA Guaranty | Commercial and Industrial | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			(6,000)
Balance, end of year					(6,000)
Comm SBA PPP | Commercial and Industrial
Collectively evaluated for impairment:
Collectively evaluated for impairment, Related loan balance	2,571,000		2,571,000		9,912,000
Consumer and Indirect | Consumer Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			11,000	11,000	11,000
Charged off			(3,000)
Recoveries					6,000
Provision for loan losses			18,000		6,000
Balance, end of year	72,000		72,000		11,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance					11,000
Individually evaluated for impairment, Related loan balance					39,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	72,000		72,000
Collectively evaluated for impairment, Related loan balance	2,398,000		2,398,000		3,024,000
Consumer and Indirect | Consumer Loans | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			46,000
Balance, end of year					46,000
Automobile | Consumer Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			569,000	$ 805,000	805,000
Charged off			(190,000)		(392,000)
Recoveries			180,000		199,000
Provision for loan losses			(75,000)		43,000
Balance, end of year	757,000		757,000		569,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	757,000		757,000		569,000
Collectively evaluated for impairment, Related loan balance	$ 58,635,000		58,635,000		74,242,000
Automobile | Consumer Loans | ASU 2016-13
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			$ 273,000
Balance, end of year					$ 273,000