LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 1,838,716	$ 1,639,083
Current period gross write offs
Total	1,231	849	$ 729
Total		1,639,083
Pass
Current period gross write offs
Total		1,618,973
Special Mention
Current period gross write offs
Total		4,917
Substandard or Lower
Current period gross write offs
Total		15,193
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2023	31,190
2022	49,798
2021	35,938
2020	32,084
2019	3,123
Prior	30,382
Revolving Loans	30,107
Revolving Loans Converted to Term	844
Total	213,466	190,461
Current period gross write offs
2023	0
2022	41
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	41	21	37
Total		190,461
Commercial, financial, and agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	31,190
2022	49,615
2021	35,901
2020	31,980
2019	3,123
Prior	29,502
Revolving Loans	29,397
Revolving Loans Converted to Term	101
Total	210,809
Current period gross write offs
Total		184,783
Commercial, financial, and agricultural | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	183
2021	37
2020	19
2019	0
Prior	138
Revolving Loans	223
Revolving Loans Converted to Term	0
Total	600
Current period gross write offs
Total		125
Commercial, financial, and agricultural | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	85
2019	0
Prior	742
Revolving Loans	487
Revolving Loans Converted to Term	743
Total	2,057
Current period gross write offs
Total		5,553
Consumer automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2023	119,922
2022	78,443
2021	19,567
2020	15,348
2019	7,305
Prior	3,813
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	244,398	186,112
Current period gross write offs
2023	30
2022	320
2021	178
2020	113
2019	8
Prior	17
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	666	386	286
Total		186,112
Consumer automobile | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	119,922
2022	78,443
2021	19,567
2020	15,348
2019	7,305
Prior	3,813
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	244,398
Current period gross write offs
Total		186,112
Consumer automobile | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0
Current period gross write offs
Total		0
Consumer automobile | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0
Current period gross write offs
Total		0
Other consumer installment loans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,952
2022	2,188
2021	1,177
2020	524
2019	407
Prior	3,071
Revolving Loans	0
Revolving Loans Converted to Term	42
Total	10,361	10,361
Current period gross write offs
2023	232
2022	47
2021	23
2020	8
2019	12
Prior	34
Revolving Loans	13
Revolving Loans Converted to Term	11
Total	380	267	173
Total		10,361
Other consumer installment loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,952
2022	2,188
2021	1,177
2020	524
2019	407
Prior	3,071
Revolving Loans	0
Revolving Loans Converted to Term	42
Total	10,361
Current period gross write offs
Total		10,361
Other consumer installment loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0
Current period gross write offs
Total		0
Other consumer installment loans | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0
Current period gross write offs
Total		0
Residential | Real estate mortgage:
Financing Receivable, Credit Quality Indicator [Line Items]
2023	135,939
2022	134,921
2021	89,117
2020	51,378
2019	33,914
Prior	150,592
Revolving Loans	56,519
Revolving Loans Converted to Term	146,121
Total	798,501	708,209
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	9
Revolving Loans	73
Revolving Loans Converted to Term	0
Total	82	21	219
Total		708,209
Residential | Real estate mortgage: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	135,939
2022	134,077
2021	88,844
2020	51,378
2019	33,914
Prior	148,802
Revolving Loans	56,519
Revolving Loans Converted to Term	146,055
Total	795,528
Current period gross write offs
Total		705,515
Residential | Real estate mortgage: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	844
2021	273
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	1,117
Current period gross write offs
Total		266
Residential | Real estate mortgage: | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	1,790
Revolving Loans	0
Revolving Loans Converted to Term	66
Total	1,856
Current period gross write offs
Total		2,428
Commercial | Real estate mortgage:
Financing Receivable, Credit Quality Indicator [Line Items]
2023	55,664
2022	107,791
2021	131,084
2020	49,603
2019	24,163
Prior	150,137
Revolving Loans	12,338
Revolving Loans Converted to Term	821
Total	531,601	500,632
Current period gross write offs
2023	59
2022	0
2021	0
2020	0
2019	0
Prior	3
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	62	154	14
Total		500,632
Commercial | Real estate mortgage: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	55,664
2022	107,638
2021	128,094
2020	49,603
2019	24,104
Prior	144,377
Revolving Loans	12,338
Revolving Loans Converted to Term	821
Total	522,639
Current period gross write offs
Total		488,993
Commercial | Real estate mortgage: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	153
2021	2,990
2020	0
2019	0
Prior	1,891
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	5,034
Current period gross write offs
Total		4,526
Commercial | Real estate mortgage: | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	59
Prior	3,869
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	3,928
Current period gross write offs
Total		7,113
Construction | Real estate mortgage:
Financing Receivable, Credit Quality Indicator [Line Items]
2023	25,494
2022	6,837
2021	1,742
2020	1,302
2019	392
Prior	4,361
Revolving Loans	261
Revolving Loans Converted to Term	0
Total	40,389	43,308
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0	0	$ 0
Total		43,308
Construction | Real estate mortgage: | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	25,494
2022	6,837
2021	1,742
2020	1,302
2019	392
Prior	4,272
Revolving Loans	261
Revolving Loans Converted to Term	0
Total	40,300
Current period gross write offs
Total		43,209
Construction | Real estate mortgage: | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	0
Current period gross write offs
Total		0
Construction | Real estate mortgage: | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	89
Revolving Loans	0
Revolving Loans Converted to Term	0
Total	$ 89
Current period gross write offs
Total		$ 99