LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Number of days past due after which a retail loan is rated	90 days
Loans	$ 1,312,903	$ 1,315,609
Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	428,037	444,641
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	826,396	819,733
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	18,534	21,282
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	29,701	26,847
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	10,235	3,106
Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	230,922	203,412
Commercial mortgages:
Financing Receivable, Recorded Investment [Line Items]
Loans	650,570	662,988
Commercial mortgages: | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	44,082	54,626
Commercial mortgages: | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	606,488	608,362
Commercial mortgages: | Not Rated | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial mortgages: | Not Rated | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial mortgages: | Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	40,304	54,517
Commercial mortgages: | Pass | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	577,266	574,221
Commercial mortgages: | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	168	0
Commercial mortgages: | Special Mention | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	12,451	16,830
Commercial mortgages: | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	3,610	109
Commercial mortgages: | Substandard | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	12,356	15,948
Commercial mortgages: | Doubtful | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial mortgages: | Doubtful | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	4,415	1,363
Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	188,874	183,225
Residential Mortgages | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	186,719	180,570
Residential Mortgages | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		0
Residential Mortgages | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Residential Mortgages | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	2,155	2,655
Residential Mortgages | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	242,537	265,984
Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,450
Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	92,065	98,466
Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	135,366	149,806
Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	15,106	16,262
Consumer Loans | Not Rated | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,450
Consumer Loans | Not Rated | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	91,424	97,283
Consumer Loans | Not Rated | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	134,795	149,113
Consumer Loans | Not Rated | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	15,099	16,225
Consumer Loans | Pass | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Pass | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Pass | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Pass | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Special Mention | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Special Mention | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Special Mention | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Special Mention | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Substandard | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Substandard | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	641	1,183
Consumer Loans | Substandard | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	571	693
Consumer Loans | Substandard | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	7	37
Consumer Loans | Doubtful | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Doubtful | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Doubtful | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans | Doubtful | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial and industrial | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	230,648	203,083
Commercial and industrial | Commercial, and Agricultural | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial and industrial | Commercial, and Agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	208,552	190,666
Commercial and industrial | Commercial, and Agricultural | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	5,915	4,452
Commercial and industrial | Commercial, and Agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	10,361	6,222
Commercial and industrial | Commercial, and Agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	5,820	1,743
Agricultural | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	274	329
Agricultural | Commercial, and Agricultural | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Agricultural | Commercial, and Agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	274	329
Agricultural | Commercial, and Agricultural | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Agricultural | Commercial, and Agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Agricultural | Commercial, and Agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	186,719	180,570
Performing | Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,450
Performing | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	91,424	97,283
Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	134,795	149,113
Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	15,099	16,225
Non-Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	2,155	2,655
Non-Performing | Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Non-Performing | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	641	1,183
Non-Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	571	693
Non-Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 7	$ 37