LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in allowance
Beginning Balance	$ 15,637	$ 14,176	$ 13,803
Charge-offs	(1,231)	(849)	(729)
Recoveries	1,756	400	462
Provision	(927)	1,910	640
Ending Balance	11,446	15,637	14,176
Adoption Impact
Changes in allowance
Beginning Balance	(3,789)
Ending Balance		(3,789)
Commercial, financial, and agricultural
Changes in allowance
Beginning Balance	1,914	1,946	1,936
Charge-offs	(41)	(21)	(37)
Recoveries	1,538	186	27
Provision	(2,688)	(197)	20
Ending Balance	3,379	1,914	1,946
Commercial, financial, and agricultural \| Adoption Impact
Changes in allowance
Beginning Balance	2,656
Ending Balance		2,656
Real estate mortgage: \| Residential
Changes in allowance
Beginning Balance	5,061	4,701	4,460
Charge-offs	(82)	(21)	(219)
Recoveries	29	47	112
Provision	85	334	348
Ending Balance	1,200	5,061	4,701
Real estate mortgage: \| Residential \| Adoption Impact
Changes in allowance
Beginning Balance	(3,893)
Ending Balance		(3,893)
Real estate mortgage: \| Commercial
Changes in allowance
Beginning Balance	6,110	5,336	3,635
Charge-offs	(62)	(154)	(14)
Recoveries	26	4	109
Provision	(62)	924	1,606
Ending Balance	3,352	6,110	5,336
Real estate mortgage: \| Commercial \| Adoption Impact
Changes in allowance
Beginning Balance	(2,660)
Ending Balance		(2,660)
Real estate mortgage: \| Construction
Changes in allowance
Beginning Balance	188	179	134
Charge-offs	0	0	0
Recoveries	0	29	10
Provision	53	(20)	35
Ending Balance	145	188	179
Real estate mortgage: \| Construction \| Adoption Impact
Changes in allowance
Beginning Balance	(96)
Ending Balance		(96)
Consumer automobile loans
Changes in allowance
Beginning Balance	1,617	1,411	1,906
Charge-offs	(666)	(386)	(286)
Recoveries	79	58	143
Provision	1,398	534	(352)
Ending Balance	2,668	1,617	1,411
Consumer automobile loans \| Adoption Impact
Changes in allowance
Beginning Balance	240
Ending Balance		240
Other consumer installment loans
Changes in allowance
Beginning Balance	109	111	261
Charge-offs	(380)	(267)	(173)
Recoveries	84	76	61
Provision	287	189	(38)
Ending Balance	702	109	111
Other consumer installment loans \| Adoption Impact
Changes in allowance
Beginning Balance	602
Ending Balance		602
Unallocated
Changes in allowance
Beginning Balance	638	492	1,471
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	0	146	(979)
Ending Balance	0	638	$ 492
Unallocated \| Adoption Impact
Changes in allowance
Beginning Balance	$ (638)
Ending Balance		$ (638)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

+ Details

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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