LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Number of days past due after which a retail loan is rated	90 days
Loans	$ 1,315,609	$ 1,315,582
Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	444,641	464,414
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	819,733	807,976
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	21,282	14,112
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	26,847	25,489
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	3,106	2,799
Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	203,412	199,576
Commercial mortgages:
Financing Receivable, Recorded Investment [Line Items]
Loans	662,988	646,174
Commercial mortgages: | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	54,626	45,688
Commercial mortgages: | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	608,362	600,486
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	54,517	45,553
Commercial mortgages: | Pass | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	574,221	575,321
Commercial mortgages: | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial mortgages: | Special Mention | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	16,830	9,665
Commercial mortgages: | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	109	135
Commercial mortgages: | Substandard | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	15,948	13,331
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	1,363	1,377
Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	183,225	194,937
Residential Mortgages | Not Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	180,570	191,777
Residential Mortgages | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Residential Mortgages | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Residential Mortgages | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	2,655	3,160
Residential Mortgages | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	265,984	274,895
Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	1,450	1,516
Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	98,466	100,878
Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	149,806	153,532
Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	16,262	18,969
Consumer Loans | Not Rated | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	1,450	1,516
Consumer Loans | Not Rated | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	97,283	99,568
Consumer Loans | Not Rated | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	149,113	152,598
Consumer Loans | Not Rated | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	16,225	18,955
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	1,183	1,310
Consumer Loans | Substandard | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	693	934
Consumer Loans | Substandard | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	37	14
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
Loans acquired with deteriorated credit quality
Financing Receivable, Recorded Investment [Line Items]
Loans	0	792
Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Commercial mortgages:
Financing Receivable, Recorded Investment [Line Items]
Loans	0	792
Loans acquired with deteriorated credit quality | Commercial mortgages: | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Commercial mortgages: | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	0	792
Loans acquired with deteriorated credit quality | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Loans acquired with deteriorated credit quality | Consumer Loans | 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	203,083	199,030
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	190,666	186,556
Commercial and industrial | Commercial, and Agricultural | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	4,452	4,447
Commercial and industrial | Commercial, and Agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	6,222	6,605
Commercial and industrial | Commercial, and Agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	1,743	1,422
Commercial and industrial | Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Agricultural | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	329	546
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	329	546
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
Agricultural | Loans acquired with deteriorated credit quality | Commercial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	180,570	191,777
Performing | Consumer Loans | Credit cards
Financing Receivable, Recorded Investment [Line Items]
Loans	1,450	1,516
Performing | Consumer Loans | Home equity lines and loans
Financing Receivable, Recorded Investment [Line Items]
Loans	97,283	99,568
Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	149,113	152,598
Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	16,225	18,955
Non-Performing | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans	2,655	3,160
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	1,183	1,310
Non-Performing | Consumer Loans | Indirect Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	693	934
Non-Performing | Consumer Loans | Direct consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 37	$ 14