LOANS - Impaired Loans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Recorded Investment
Impaired loans without a valuation allowance	$ 30,136,000		$ 30,136,000		$ 28,889,000
Impaired loans with a valuation allowance	20,066,000		20,066,000		15,991,000
Total impaired loans	50,202,000		50,202,000		44,880,000
Unpaid Principal Balance
Impaired loans without a valuation allowance	34,398,000		34,398,000		30,815,000
Impaired loans with a valuation allowance	20,403,000		20,403,000		16,544,000
Total impaired loans	54,801,000		54,801,000		47,359,000
Activity in the allowance for loan losses
Allowance for loan losses for impaired loans	1,523,000		1,523,000		1,161,000
Impaired loans
Average Recorded Investment	47,645,000	$ 37,426,000	46,723,000	$ 37,299,000
Interest Income Recognized	254,000	418,000	583,000	971,000
Interest Income Recognized on Cash Basis	197,000	324,000	526,000	782,000
Additional funds committed to be advanced in connection with impaired loans	0	0	0	0
Residential
Recorded Investment
Impaired loans without a valuation allowance	10,725,000		10,725,000		11,610,000
Impaired loans with a valuation allowance	14,297,000		14,297,000		15,665,000
Unpaid Principal Balance
Impaired loans without a valuation allowance	11,706,000		11,706,000		12,140,000
Impaired loans with a valuation allowance	14,634,000		14,634,000		16,218,000
Activity in the allowance for loan losses
Allowance for loan losses for impaired loans	1,066,000		1,066,000		985,000
Impaired loans
Average Recorded Investment	25,241,000	30,868,000	25,919,000	30,818,000
Interest Income Recognized	253,000	408,000	575,000	948,000
Interest Income Recognized on Cash Basis	196,000	314,000	518,000	759,000
Commercial real estate | Commercial
Recorded Investment
Impaired loans without a valuation allowance	3,631,000		3,631,000		530,000
Unpaid Principal Balance
Impaired loans without a valuation allowance	4,770,000		4,770,000		530,000
Impaired loans
Average Recorded Investment	3,668,000	92,000	2,622,000	895,000
Interest Income Recognized	1,000		1,000
Interest Income Recognized on Cash Basis	1,000		1,000
Commercial construction | Commercial
Recorded Investment
Impaired loans without a valuation allowance	10,971,000		10,971,000		11,244,000
Unpaid Principal Balance
Impaired loans without a valuation allowance	11,244,000		11,244,000		11,244,000
Impaired loans
Average Recorded Investment	10,971,000		11,062,000
Commercial and industrial | Commercial
Recorded Investment
Impaired loans without a valuation allowance	4,809,000		4,809,000		5,505,000
Impaired loans with a valuation allowance	5,769,000		5,769,000		326,000
Unpaid Principal Balance
Impaired loans without a valuation allowance	6,678,000		6,678,000		6,901,000
Impaired loans with a valuation allowance	5,769,000		5,769,000		326,000
Activity in the allowance for loan losses
Allowance for loan losses for impaired loans	457,000		457,000		$ 176,000
Impaired loans
Average Recorded Investment	$ 7,765,000	6,466,000	7,120,000	5,586,000
Interest Income Recognized		10,000	7,000	23,000
Interest Income Recognized on Cash Basis		$ 10,000	$ 7,000	$ 23,000