Loans - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 11,848	$ 11,446	$ 11,446
Charge-offs	(397)	(525)
Recoveries	1,354	145
Provision	(2,815)	476
Ending Balance	9,990	11,542	11,848
Commercial, Financial, and Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,323	3,379	3,379
Charge-offs	(1)	(90)	(176)
Recoveries	378	70
Provision	(1,132)	(308)
Ending Balance	1,568	3,051	2,323
Real Estate Mortgages \| Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	726	1,200	1,200
Charge-offs	(3)	(4)	(40)
Recoveries	1	2
Provision	333	(479)
Ending Balance	1,057	719	726
Real Estate Mortgages \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,299	3,352	3,352
Charge-offs	0	0	(3)
Recoveries	0	2
Provision	(2,224)	1,292
Ending Balance	3,075	4,646	5,299
Real Estate Mortgages \| Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7	145	145
Charge-offs	0	0	0
Recoveries	0	0
Provision	4	(136)
Ending Balance	11	9	7
Consumer automobile
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,909	2,668	2,668
Charge-offs	(296)	(336)	(1,081)
Recoveries	22	44
Provision	1,055	111
Ending Balance	3,690	2,487	2,909
Other consumer installment loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	584	702	702
Charge-offs	(97)	(95)	(296)
Recoveries	953	27
Provision	(851)	(4)
Ending Balance	$ 589	$ 630	$ 584

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

No definition available.

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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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