LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Number of days past due after which a retail loan is rated	90 days
Total recorded investment in loans	$ 1,541,498	$ 1,312,903
Loans	1,515,539	1,285,741
Not Rated
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	448,787	428,037
Pass
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	1,036,759	826,396
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	26,630	18,534
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	26,813	29,701
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	2,509	10,235
Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	370,252	230,922
Commercial mortgages:
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	719,145	650,570
Commercial mortgages: | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	62,164	44,082
Commercial mortgages: | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	656,981	606,488
Commercial mortgages: | Not Rated | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Commercial mortgages: | Not Rated | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Commercial mortgages: | Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	59,885	40,304
Commercial mortgages: | Pass | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	616,090	577,266
Commercial mortgages: | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	168
Commercial mortgages: | Special Mention | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	23,631	12,451
Commercial mortgages: | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	2,279	3,610
Commercial mortgages: | Substandard | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	16,128	12,356
Commercial mortgages: | Doubtful | Construction
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Commercial mortgages: | Doubtful | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	1,132	4,415
Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	240,013	188,874
Loans	240,013	188,874
Residential Mortgages | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	238,381	186,719
Residential Mortgages | Pass
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans		0
Residential Mortgages | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Residential Mortgages | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	1,632	2,155
Residential Mortgages | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	212,088	242,537
Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	78,761	92,065
Loans	78,761	92,065
Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	120,853	135,366
Loans	120,853	135,366
Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	12,474	15,106
Loans	12,474	15,106
Consumer Loans | Not Rated | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	77,602	91,424
Consumer Loans | Not Rated | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	120,334	134,795
Consumer Loans | Not Rated | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	12,470	15,099
Consumer Loans | Pass | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Pass | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Pass | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Special Mention | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Special Mention | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Special Mention | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Substandard | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	1,159	641
Consumer Loans | Substandard | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	519	571
Consumer Loans | Substandard | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	4	7
Consumer Loans | Doubtful | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Doubtful | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Consumer Loans | Doubtful | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Commercial and industrial | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	369,968	230,648
Commercial and industrial | Commercial, and Agricultural | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Commercial and industrial | Commercial, and Agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	360,500	208,552
Commercial and industrial | Commercial, and Agricultural | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	2,999	5,915
Commercial and industrial | Commercial, and Agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	5,092	10,361
Commercial and industrial | Commercial, and Agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	1,377	5,820
Agricultural | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	284	274
Agricultural | Commercial, and Agricultural | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial, and Agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	284	274
Agricultural | Commercial, and Agricultural | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial, and Agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Agricultural | Commercial, and Agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in loans	0	0
Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	238,381	186,719
Performing | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	77,602	91,424
Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	120,334	134,795
Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	12,470	15,099
Non-Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	1,632	2,155
Non-Performing | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	1,159	641
Non-Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	519	571
Non-Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 4	$ 7