LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Total Allowance by Loan Segment (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			$ 2,541,000	$ 2,589,000	$ 2,589,000
Charged off			(519,000)	(954,000)	(1,151,000)
Recoveries			220,000		247,000
Provision for loan losses	$ (139,000)	$ 246,000	65,000	601,000	856,000
Balance, end of year	2,307,000		2,307,000		2,541,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	210,000		210,000		226,000
Individually evaluated for impairment, Related loan balance	4,796,000		4,796,000		2,250,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	2,097,000		2,097,000		2,315,000
Collectively evaluated for impairment, Related loan balance	279,093,000		279,093,000		296,870,000
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			161,000	214,000	214,000
Charged off			(69,000)		(208,000)
Recoveries			15,000		48,000
Provision for loan losses			46,000		107,000
Balance, end of year	153,000		153,000		161,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	15,000		15,000		22,000
Individually evaluated for impairment, Related loan balance	88,000		88,000		138,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	138,000		138,000		139,000
Collectively evaluated for impairment, Related loan balance	12,281,000		12,281,000		12,933,000
Residential Real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			864,000	1,061,000	1,061,000
Charged off			(16,000)		(589,000)
Recoveries			1,000		2,000
Provision for loan losses			(210,000)		390,000
Balance, end of year	639,000		639,000		864,000
Individually evaluated for impairment:
Individually evaluated for impairment, Related loan balance	659,000		659,000		854,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	639,000		639,000		864,000
Collectively evaluated for impairment, Related loan balance	79,552,000		79,552,000		81,783,000
Indirect
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			988,000	774,000	774,000
Charged off			(407,000)		(341,000)
Recoveries			194,000		183,000
Provision for loan losses			164,000		372,000
Balance, end of year	939,000		939,000		988,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	939,000		939,000		988,000
Collectively evaluated for impairment, Related loan balance	106,088,000		106,088,000		116,698,000
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			241,000	237,000	237,000
Charged off			(27,000)
Recoveries			10,000		14,000
Provision for loan losses			2,000		(10,000)
Balance, end of year	226,000		226,000		241,000
Individually evaluated for impairment:
Individually evaluated for impairment, Balance in allowance	195,000		195,000		204,000
Individually evaluated for impairment, Related loan balance	195,000		195,000		204,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	31,000		31,000		37,000
Collectively evaluated for impairment, Related loan balance	11,155,000		11,155,000		14,080,000
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			4,000	12,000	12,000
Provision for loan losses			3,000		(8,000)
Balance, end of year	7,000		7,000		4,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	7,000		7,000		4,000
Collectively evaluated for impairment, Related loan balance	3,161,000		3,161,000		2,317,000
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of year			283,000	$ 291,000	291,000
Charged off					(13,000)
Provision for loan losses			60,000		5,000
Balance, end of year	343,000		343,000		283,000
Individually evaluated for impairment:
Individually evaluated for impairment, Related loan balance	3,854,000		3,854,000		1,054,000
Collectively evaluated for impairment:
Collectively evaluated for impairment, Balance in allowance	343,000		343,000		283,000
Collectively evaluated for impairment, Related loan balance	$ 66,856,000		$ 66,856,000		$ 69,059,000