ALLOWANCE FOR CREDIT LOSSES - Charge-offs and recoveries by loan class and vintage (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Charge-off	$ (537)	$ (4,560)	$ (1,458)
Recovery	1,107	969	660
Net (Charge-off) Recovery	570	(3,591)	(798)
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(519)	(714)	(1,252)
Recovery	953	794	489
Net (Charge-off) Recovery	434	80	(763)
Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(13)	(112)	(97)
Recovery	106	14	71
Net (Charge-off) Recovery	93	(98)	(26)
Agriculture
Financing Receivable, Recorded Investment [Line Items]
Recovery	47	12	10
Net (Charge-off) Recovery	47	12	10
1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(5)	(71)	(12)
Recovery	1	1	3
Net (Charge-off) Recovery	(4)	(70)	(9)
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(163)	(45)
Recovery		147	81
Net (Charge-off) Recovery		(16)	$ 36
2021
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(10)
Recovery	2
Net (Charge-off) Recovery	(8)
2021 | Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(10)
Recovery	2
Net (Charge-off) Recovery	(8)
2020
Financing Receivable, Recorded Investment [Line Items]
Recovery		5
Net (Charge-off) Recovery		5
2020 | Consumer
Financing Receivable, Recorded Investment [Line Items]
Recovery		5
Net (Charge-off) Recovery		5
2019
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(194)	(3,605)
Recovery	11	5
Net (Charge-off) Recovery	(183)	(3,600)
2019 | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(191)	(38)
Recovery	6	3
Net (Charge-off) Recovery	(185)	(35)
2019 | Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(3)	(3)
Recovery	5	2
Net (Charge-off) Recovery	2	(1)
2019 | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(64)
Net (Charge-off) Recovery		(64)
2019 | Other:
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(3,500)
Net (Charge-off) Recovery		(3,500)
2018
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(260)	(71)
Recovery	70	178
Net (Charge-off) Recovery	(190)	107
2018 | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(260)	(57)
Recovery	70	170
Net (Charge-off) Recovery	(190)	113
2018 | Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(14)
Recovery		6
Net (Charge-off) Recovery		(8)
2018 | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Recovery		2
Net (Charge-off) Recovery		2
2017
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(130)
Recovery	48	47
Net (Charge-off) Recovery	48	(83)
2017 | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(35)
Recovery	48	46
Net (Charge-off) Recovery	48	11
2017 | Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(95)
Net (Charge-off) Recovery		(95)
2017 | Other:
Financing Receivable, Recorded Investment [Line Items]
Recovery		1
Net (Charge-off) Recovery		1
2016
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(42)
Recovery		41
Net (Charge-off) Recovery		(1)
2016 | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(42)
Recovery		29
Net (Charge-off) Recovery		(13)
2016 | Agriculture
Financing Receivable, Recorded Investment [Line Items]
Recovery		12
Net (Charge-off) Recovery		12
Prior
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(5)	(170)
Recovery	924	473
Net (Charge-off) Recovery	919	303
Prior | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Recovery	777	326
Net (Charge-off) Recovery	777	326
Prior | Consumer
Financing Receivable, Recorded Investment [Line Items]
Recovery	99	1
Net (Charge-off) Recovery	99	1
Prior | Agriculture
Financing Receivable, Recorded Investment [Line Items]
Recovery	47
Net (Charge-off) Recovery	47
Prior | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(5)	(7)
Recovery	1	1
Net (Charge-off) Recovery	(4)	(6)
Prior | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(163)
Recovery		145
Net (Charge-off) Recovery		(18)
Revolving Loans
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(68)	(542)
Recovery	52	220
Net (Charge-off) Recovery	(16)	(322)
Revolving Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(68)	(542)
Recovery	52	220
Net (Charge-off) Recovery	(16)	(322)
Converted Revolving Loans
Financing Receivable, Recorded Investment [Line Items]
Recovery		8
Net (Charge-off) Recovery		8
Converted Revolving Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Recovery		8
Net (Charge-off) Recovery		8
Total loans by loan class and vintage
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(537)	(4,560)
Recovery	1,107	977
Net (Charge-off) Recovery	570	(3,583)
Total loans by loan class and vintage | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(519)	(714)
Recovery	953	802
Net (Charge-off) Recovery	434	88
Total loans by loan class and vintage | Consumer
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(13)	(112)
Recovery	106	14
Net (Charge-off) Recovery	93	(98)
Total loans by loan class and vintage | Agriculture
Financing Receivable, Recorded Investment [Line Items]
Recovery	47	12
Net (Charge-off) Recovery	47	12
Total loans by loan class and vintage | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Charge-off	(5)	(71)
Recovery	1	1
Net (Charge-off) Recovery	$ (4)	(70)
Total loans by loan class and vintage | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(163)
Recovery		147
Net (Charge-off) Recovery		(16)
Total loans by loan class and vintage | Other:
Financing Receivable, Recorded Investment [Line Items]
Charge-off		(3,500)
Recovery		1
Net (Charge-off) Recovery		$ (3,499)