Loans - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 11,446	$ 15,637	$ 15,637
Charge-offs	(525)	(262)
Recoveries	145	139
Provision for credit losses	476	9
Ending Balance	11,542	11,734	11,446
Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		(3,789)	(3,789)
Commercial, financial, and agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,379	1,914	1,914
Charge-offs	(90)	0	(41)
Recoveries	70	105
Provision for credit losses	(308)	(813)
Ending Balance	3,051	3,862	3,379
Commercial, financial, and agricultural \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		2,656	2,656
Real Estate Mortgages \| Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,200	5,061	5,061
Charge-offs	(4)	(78)	(82)
Recoveries	2	2
Provision for credit losses	(479)	320
Ending Balance	719	1,412	1,200
Real Estate Mortgages \| Residential \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		(3,893)	(3,893)
Real Estate Mortgages \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,352	6,110	6,110
Charge-offs	0	(3)	(62)
Recoveries	2	3
Provision for credit losses	1,292	31
Ending Balance	4,646	3,481	3,352
Real Estate Mortgages \| Commercial \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		(2,660)	(2,660)
Real Estate Mortgages \| Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	145	188	188
Charge-offs	0	0	0
Recoveries	0	0
Provision for credit losses	(136)	92
Ending Balance	9	184	145
Real Estate Mortgages \| Construction \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		(96)	(96)
Consumer automobile loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,668	1,617	1,617
Charge-offs	(336)	(93)	(666)
Recoveries	44	12
Provision for credit losses	111	337
Ending Balance	2,487	2,113	2,668
Consumer automobile loans \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		240	240
Other consumer installment loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	702	109	109
Charge-offs	(95)	(88)	(380)
Recoveries	27	17
Provision for credit losses	(4)	42
Ending Balance	630	682	702
Other consumer installment loans \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		602	602
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0	638	638
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	0	0
Ending Balance	$ 0	0	0
Unallocated \| Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ (638)	$ (638)

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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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