LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	$ 23,478	$ 18,944	$ 21,161
Charge Offs	(7,380)	(1,975)	(5,919)
Recoveries	587	564	549
Net (charge offs) recoveries	(6,793)	(1,411)	(5,370)
Provision	4,239	5,945	3,153
Ending balance	20,924	23,478	18,944
Ending allowance balance attributable to loans:
Individually evaluated for impairment				$ 1,527	$ 8,097
Collectively evaluated for impairment				19,397	15,381
Allowance for loan losses	23,478	23,478	18,944	20,924	23,478
Loans:
Loans individually evaluated for impairment				10,589	15,665
Loans collectively evaluated for impairment				1,530,909	1,297,238
Total recorded investment in loans				1,541,498	1,312,903
Commercial, and Agricultural
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	10,227	5,383	6,976
Charge Offs	(4,068)	(312)	(3,644)
Recoveries	89	59	47
Net (charge offs) recoveries	(3,979)	(253)	(3,597)
Provision	(1,755)	5,097	2,004
Ending balance	4,493	10,227	5,383
Ending allowance balance attributable to loans:
Individually evaluated for impairment				1,401	6,000
Collectively evaluated for impairment				3,092	4,227
Allowance for loan losses	4,493	5,383	5,383	4,493	10,227
Loans:
Loans individually evaluated for impairment				3,400	6,147
Loans collectively evaluated for impairment				366,852	224,775
Total recorded investment in loans				370,252	230,922
Commercial mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	8,869	8,184	8,514
Charge Offs	(2,143)	(1)	(213)
Recoveries	14	4	3
Net (charge offs) recoveries	(2,129)	3	(210)
Provision	4,756	682	(120)
Ending balance	11,496	8,869	8,184
Ending allowance balance attributable to loans:
Individually evaluated for impairment				74	2,097
Collectively evaluated for impairment				11,422	6,772
Allowance for loan losses	8,869	8,869	8,184	11,496	8,869
Loans:
Loans individually evaluated for impairment				5,117	8,844
Loans collectively evaluated for impairment				714,028	641,726
Total recorded investment in loans				719,145	650,570
Residential Mortgages
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	1,252	1,226	1,316
Charge Offs	(56)	(151)	(226)
Recoveries	86	45	5
Net (charge offs) recoveries	30	(106)	(221)
Provision	797	132	131
Ending balance	2,079	1,252	1,226
Ending allowance balance attributable to loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				2,079	1,252
Allowance for loan losses	2,079	1,252	1,316	2,079	1,252
Loans:
Loans individually evaluated for impairment				1,271	525
Loans collectively evaluated for impairment				238,742	188,349
Total recorded investment in loans				240,013	188,874
Consumer Loans
Allowance for loan losses, by portfolio segment [Roll Forward]
Beginning balance:	3,130	4,151	4,355
Charge Offs	(1,113)	(1,511)	(1,836)
Recoveries	398	456	494
Net (charge offs) recoveries	(715)	(1,055)	(1,342)
Provision	441	34	1,138
Ending balance	2,856	3,130	4,151
Ending allowance balance attributable to loans:
Individually evaluated for impairment				52	0
Collectively evaluated for impairment				2,804	3,130
Allowance for loan losses	$ 3,130	$ 4,151	$ 4,151	2,856	3,130
Loans:
Loans individually evaluated for impairment				801	149
Loans collectively evaluated for impairment				211,287	242,388
Total recorded investment in loans				$ 212,088	$ 242,537