SHORT-TERM BORROWINGS - Schedule of Short-term borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SHORT-TERM BORROWINGS
Balance at year end	$ 5,747	$ 5,244
Line of Credit
SHORT-TERM BORROWINGS
Additional lines of credit available from correspondent banks other than the FHLB	100,000
Repurchase Agreements
SHORT-TERM BORROWINGS
Balance at year end	5,747	5,244	$ 4,920
Maximum amount outstanding at any month end	9,757	18,468	10,097
Average balance outstanding during the year	$ 7,178	$ 10,669	$ 5,971
Weighted-average interest rate: At year end (as a percent)	0.12%	0.14%	0.22%
Weighted-average interest rate: Paid during the year (as a percent)	0.13%	0.20%	0.18%
Overnight
SHORT-TERM BORROWINGS
Balance at year end	$ 0	$ 0	$ 0
Maximum amount outstanding at any month end	0	13,778	120,540
Average balance outstanding during the year	$ 0	$ 1,991	$ 28,926
Weighted-average interest rate: At year end (as a percent)	0.00%	0.00%	0.00%
Weighted-average interest rate: Paid during the year (as a percent)	0.00%	1.09%	2.70%