Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 21,979		$ 14,279	$ 15,588	[1]	$ 16,903
Additions:
Provision for (release of ) credit losses	165		1,200	815		(1,300)
Deductions:
Loans charged off	103		188	196		354
Less recoveries on loans	(195)		(62)	(236)		(104)
Net loan charge-offs (recoveries)	(92)		126	(40)		250
Balance at end of period	22,236	[1]	15,353	22,236	[1]	15,353
Liability for Unfunded Commitments
Beginning balance				0
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				5,793
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				21,381
Unfunded Loan Commitment
Deductions:
Balance at end of period	1,100			1,100
Liability for Unfunded Commitments
Beginning balance	1,302			0
Provision for credit losses on unfunded commitments	(165)			(135)
Ending balance	1,137			1,137
Allowance for credit losses on loans and liability for unfunded commitments	23,373			23,373
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				1,272
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				1,272
Commercial, Financial, and Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	1,921		2,830	2,735		2,717
Additions:
Provision for (release of ) credit losses	(227)		184	(373)		312
Deductions:
Loans charged off	14		25	43		60
Less recoveries on loans	(164)		(16)	(174)		(36)
Net loan charge-offs (recoveries)	(150)		9	(131)		24
Balance at end of period	1,844		3,005	1,844		3,005
Commercial, Financial, and Agricultural | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				(649)
Commercial, Financial, and Agricultural | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				2,086
Commercial, Financial, and Agricultural | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	124			0
Provision for credit losses on unfunded commitments	(12)			8
Ending balance	112			112
Allowance for credit losses on loans and liability for unfunded commitments	1,956			1,956
Commercial, Financial, and Agricultural | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				104
Commercial, Financial, and Agricultural | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				104
Real Estate Construction - Residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	631		60	157		137
Additions:
Provision for (release of ) credit losses	117		6	300		(71)
Deductions:
Loans charged off	0		0	0		0
Less recoveries on loans	0		0	0		0
Net loan charge-offs (recoveries)	0		0	0		0
Balance at end of period	748		66	748		66
Real Estate Construction - Residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				291
Real Estate Construction - Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				448
Real Estate Construction - Residential | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	389			0
Provision for credit losses on unfunded commitments	(34)			14
Ending balance	355			355
Allowance for credit losses on loans and liability for unfunded commitments	1,103			1,103
Real Estate Construction - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				341
Real Estate Construction - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				341
Real Estate Construction - Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	4,464		664	875		588
Additions:
Provision for (release of ) credit losses	(1,042)		98	(347)		174
Deductions:
Loans charged off	0		0	0		0
Less recoveries on loans	0		0	0		0
Net loan charge-offs (recoveries)	0		0	0		0
Balance at end of period	3,422		762	3,422		762
Real Estate Construction - Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				2,894
Real Estate Construction - Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				3,769
Real Estate Construction - Commercial | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	562			0
Provision for credit losses on unfunded commitments	(148)			(155)
Ending balance	414			414
Allowance for credit losses on loans and liability for unfunded commitments	3,836			3,836
Real Estate Construction - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				569
Real Estate Construction - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				569
Real Estate Mortgage - Residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	5,262		2,578	3,329		2,482
Additions:
Provision for (release of ) credit losses	201		149	242		242
Deductions:
Loans charged off	0		0	0		0
Less recoveries on loans	(2)		(20)	(4)		(23)
Net loan charge-offs (recoveries)	(2)		(20)	(4)		(23)
Balance at end of period	5,465		2,747	5,465		2,747
Real Estate Mortgage - Residential | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				1,890
Real Estate Mortgage - Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				5,219
Real Estate Mortgage - Residential | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	110			0
Provision for credit losses on unfunded commitments	(2)			1
Ending balance	108			108
Allowance for credit losses on loans and liability for unfunded commitments	5,573			5,573
Real Estate Mortgage - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				107
Real Estate Mortgage - Residential | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				107
Real Estate Mortgage - Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	9,487		7,692	8,000		10,662
Additions:
Provision for (release of ) credit losses	828		821	706		(2,077)
Deductions:
Loans charged off	20		104	25		178
Less recoveries on loans	0		(1)	(1)		(3)
Net loan charge-offs (recoveries)	20		103	24		175
Balance at end of period	10,295		8,410	10,295		8,410
Real Estate Mortgage - Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				1,613
Real Estate Mortgage - Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				9,613
Real Estate Mortgage - Commercial | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	142			0
Provision for credit losses on unfunded commitments	(16)			(24)
Ending balance	126			126
Allowance for credit losses on loans and liability for unfunded commitments	10,421			10,421
Real Estate Mortgage - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				150
Real Estate Mortgage - Commercial | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				150
Installment and Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	222		273	326		256
Additions:
Provision for (release of ) credit losses	35		73	42		130
Deductions:
Loans charged off	69		59	128		116
Less recoveries on loans	(29)		(25)	(57)		(42)
Net loan charge-offs (recoveries)	40		34	71		74
Balance at end of period	217		312	217		312
Installment and Other Consumer | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				(80)
Installment and Other Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				246
Installment and Other Consumer | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	1			0
Provision for credit losses on unfunded commitments	0			0
Ending balance	1			1
Allowance for credit losses on loans and liability for unfunded commitments	218			218
Installment and Other Consumer | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				1
Installment and Other Consumer | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				1
Un- allocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	(8)		182	166		61
Additions:
Provision for (release of ) credit losses	253		(131)	245		(10)
Deductions:
Loans charged off	0			0		0
Less recoveries on loans	0			0		0
Net loan charge-offs (recoveries)	0		0	0		0
Balance at end of period	245		$ 51	245		$ 51
Un- allocated | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				(166)
Un- allocated | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period				0
Un- allocated | Unfunded Loan Commitment
Liability for Unfunded Commitments
Beginning balance	(26)			0
Provision for credit losses on unfunded commitments	47			21
Ending balance	21			21
Allowance for credit losses on loans and liability for unfunded commitments	$ 266			266
Un- allocated | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Liability for Unfunded Commitments
Beginning balance				0
Un- allocated | Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Liability for Unfunded Commitments
Beginning balance				$ 0

[1] amounts include the impacts of the January 1, 2023 adoption of ASU 2016-13. See Note 2 for details.See accompanying notes to the consolidated financial statements (unaudited)