Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for Credit Losses on Loans
Balance at beginning of period	$ 23,744	$ 15,588	$ 15,588
Charge-offs	(124)	(93)	(628)
Recoveries	55	41
Provision for (release of ) credit losses	0	650
Balance at end of period	23,675	21,979	23,744
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		5,793	5,793
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		21,381	21,381
Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Balance at end of period	700
Liability for Unfunded Commitments
Beginning balance	947
Provision for (release of) credit losses on unfunded commitments	(230)	30
Ending balance	717	1,302	947
Allowance for credit losses on loans and liability for unfunded commitments	24,392	23,281
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		1,272	1,272
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		1,272	1,272
Commercial, Financial, and Agricultural
Allowance for Credit Losses on Loans
Balance at beginning of period	3,208	2,735	2,735
Charge-offs	(30)	(30)	(161)
Recoveries	10	9
Provision for (release of ) credit losses	186	(144)
Balance at end of period	3,374	1,921	3,208
Commercial, Financial, and Agricultural | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		(649)	(649)
Commercial, Financial, and Agricultural | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		2,086	2,086
Commercial, Financial, and Agricultural | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	197
Provision for (release of) credit losses on unfunded commitments	(105)	20
Ending balance	92	124	197
Allowance for credit losses on loans and liability for unfunded commitments	3,466	2,045
Commercial, Financial, and Agricultural | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		104	104
Commercial, Financial, and Agricultural | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		104	104
Real estate construction − residential
Allowance for Credit Losses on Loans
Balance at beginning of period	1,043	157	157
Charge-offs	0	0	0
Recoveries	0	0
Provision for (release of ) credit losses	(371)	183
Balance at end of period	672	631	1,043
Real estate construction − residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		291	291
Real estate construction − residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		448	448
Real estate construction − residential | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	273
Provision for (release of) credit losses on unfunded commitments	(159)	48
Ending balance	114	389	273
Allowance for credit losses on loans and liability for unfunded commitments	786	1,020
Real estate construction − residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		341	341
Real estate construction − residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		341	341
Real Estate Construction - Commercial
Allowance for Credit Losses on Loans
Balance at beginning of period	3,273	875	875
Charge-offs	0	0	0
Recoveries	0	0
Provision for (release of ) credit losses	(1,976)	695
Balance at end of period	1,297	4,464	3,273
Real Estate Construction - Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		2,894	2,894
Real Estate Construction - Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		3,769	3,769
Real Estate Construction - Commercial | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	245
Provision for (release of) credit losses on unfunded commitments	57	(7)
Ending balance	302	562	245
Allowance for credit losses on loans and liability for unfunded commitments	1,599	5,026
Real Estate Construction - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		569	569
Real Estate Construction - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		569	569
Real Estate Mortgage - Residential
Allowance for Credit Losses on Loans
Balance at beginning of period	5,264	3,329	3,329
Charge-offs	(1)	0	(88)
Recoveries	1	2
Provision for (release of ) credit losses	(155)	41
Balance at end of period	5,109	5,262	5,264
Real Estate Mortgage - Residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		1,890	1,890
Real Estate Mortgage - Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		5,219	5,219
Real Estate Mortgage - Residential | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	103
Provision for (release of) credit losses on unfunded commitments	0	3
Ending balance	103	110	103
Allowance for credit losses on loans and liability for unfunded commitments	5,212	5,372
Real Estate Mortgage - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		107	107
Real Estate Mortgage - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		107	107
Real Estate Mortgage - Commercial
Allowance for Credit Losses on Loans
Balance at beginning of period	10,537	8,000	8,000
Charge-offs	(23)	(5)	(32)
Recoveries	0	2
Provision for (release of ) credit losses	2,343	(123)
Balance at end of period	12,857	9,487	10,537
Real Estate Mortgage - Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		1,613	1,613
Real Estate Mortgage - Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		9,613	9,613
Real Estate Mortgage - Commercial | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	110
Provision for (release of) credit losses on unfunded commitments	(10)	(8)
Ending balance	100	142	110
Allowance for credit losses on loans and liability for unfunded commitments	12,957	9,629
Real Estate Mortgage - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		150	150
Real Estate Mortgage - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		150	150
Installment and Other Consumer
Allowance for Credit Losses on Loans
Balance at beginning of period	232	326	326
Charge-offs	(70)	(58)	(347)
Recoveries	44	28
Provision for (release of ) credit losses	(34)	6
Balance at end of period	172	222	232
Installment and Other Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		(80)	(80)
Installment and Other Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		246	246
Installment and Other Consumer | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	1
Provision for (release of) credit losses on unfunded commitments	0	0
Ending balance	1	1	1
Allowance for credit losses on loans and liability for unfunded commitments	173	223
Installment and Other Consumer | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		1	1
Installment and Other Consumer | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		1	1
Un- allocated
Allowance for Credit Losses on Loans
Balance at beginning of period	187	166	166
Charge-offs	0	0
Recoveries	0	0
Provision for (release of ) credit losses	7	(8)
Balance at end of period	194	(8)	187
Un- allocated | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		(166)	(166)
Un- allocated | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Un- allocated | Unfunded Loan Commitment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Liability for Unfunded Commitments
Beginning balance	18
Provision for (release of) credit losses on unfunded commitments	(13)	(26)
Ending balance	5	(26)	18
Allowance for credit losses on loans and liability for unfunded commitments	$ 199	(34)
Un- allocated | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Credit Losses on Loans
Balance at beginning of period		0	0
Un- allocated | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Credit Losses on Loans
Balance at beginning of period		$ 0	$ 0