Loans and Allowance for Credit Losses - Credit Quality (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	$ 51,137		$ 321,352
Year two	291,952		467,922
Year three	446,455		348,589
Year four	334,152		167,176
Year five	162,431		40,673
Prior	107,120		69,913
Revolving Loans Amortized Cost Basis	125,163		121,149
Revolving Loans Converted to Term Loans Amortized Cost Basis	443		2,373
Total	1,518,853		1,539,147
Current fiscal year, charge-offs	0		84
Fiscal year before current fiscal year, charge-offs	3		24
Two year before current fiscal year, charge-offs	5		7
Three year before current fiscal year, charge-offs	0		75
Four year before current fiscal year, charge-offs	2		0
Prior, charge-offs	114		424
Revolving loans, charge-offs	0		14
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	124	$ 93	628
Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	34,691		300,974
Year two	282,214		450,025
Year three	428,893		328,324
Year four	319,449		165,714
Year five	161,255		40,119
Prior	104,358		66,694
Revolving Loans Amortized Cost Basis	119,887		116,289
Revolving Loans Converted to Term Loans Amortized Cost Basis	443		1,074
Total	1,451,190		1,469,213
Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	12,312		16,873
Year two	0		13,751
Year three	5,876		3,180
Year four	7,947		970
Year five	0		419
Prior	0		2,489
Revolving Loans Amortized Cost Basis	0		2,698
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	26,135		40,380
Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		1,097
Year two	2,189		3,973
Year three	3,888		15,963
Year four	429		145
Year five	63		45
Prior	489		415
Revolving Loans Amortized Cost Basis	571		323
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		1,299
Total	7,629		23,260
Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	3		2,408
Year two	1,900		173
Year three	111		1,122
Year four	3,339		347
Year five	268		90
Prior	476		315
Revolving Loans Amortized Cost Basis	1,866		1,839
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	7,963		6,294
Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	4,131
Year two	5,649
Year three	7,687
Year four	2,988
Year five	845
Prior	1,797
Revolving Loans Amortized Cost Basis	2,839
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	25,936
Commercial, Financial, and Agricultural
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	8,471		40,634
Year two	34,116		49,441
Year three	46,913		33,180
Year four	31,079		31,567
Year five	30,670		4,784
Prior	7,090		5,304
Revolving Loans Amortized Cost Basis	59,679		59,853
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		1,512
Total	218,018		226,275
Current fiscal year, charge-offs	0		0
Fiscal year before current fiscal year, charge-offs	0		1
Two year before current fiscal year, charge-offs	0		0
Three year before current fiscal year, charge-offs	0		0
Four year before current fiscal year, charge-offs	2		0
Prior, charge-offs	28		160
Revolving loans, charge-offs	0		0
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	30	30	161
Commercial, Financial, and Agricultural | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	8,146		40,103
Year two	32,236		43,082
Year three	40,709		32,812
Year four	30,728		30,965
Year five	30,311		4,774
Prior	6,766		5,022
Revolving Loans Amortized Cost Basis	54,733		55,379
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		213
Total	203,629		212,350
Commercial, Financial, and Agricultural | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one			1
Year two			2,505
Year three			32
Year four			586
Year five			3
Prior			282
Revolving Loans Amortized Cost Basis			2,502
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			5,911
Commercial, Financial, and Agricultural | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		371
Year two	1,463		3,758
Year three	3,675		19
Year four	1		16
Year five	15		0
Prior	43		0
Revolving Loans Amortized Cost Basis	571		323
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		1,299
Total	5,768		5,786
Commercial, Financial, and Agricultural | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	3		159
Year two	262		96
Year three	89		317
Year four	322		0
Year five	0		7
Prior	1		0
Revolving Loans Amortized Cost Basis	1,746		1,649
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,423		2,228
Commercial, Financial, and Agricultural | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	322
Year two	155
Year three	2,440
Year four	28
Year five	344
Prior	280
Revolving Loans Amortized Cost Basis	2,629
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	6,198
Real estate construction − residential
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	2,327		40,279
Year two	38,748		17,259
Year three	5,210		634
Year four	630		175
Year five	173		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	47,088		58,347
Current fiscal year, charge-offs	0		0
Fiscal year before current fiscal year, charge-offs	0		0
Two year before current fiscal year, charge-offs	0		0
Three year before current fiscal year, charge-offs	0		0
Four year before current fiscal year, charge-offs	0		0
Prior, charge-offs	0		0
Revolving loans, charge-offs	0		0
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	0	0	0
Real estate construction − residential | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	2,327		39,847
Year two	38,291		17,259
Year three	5,210		634
Year four	630		175
Year five	173		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	46,631		57,915
Real estate construction − residential | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		432
Year two	457		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	457		432
Real Estate Construction - Commercial
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	8,553		50,685
Year two	24,263		53,075
Year three	11,073		24,371
Year four	5,093		1,040
Year five	1,025		31
Prior	810		804
Revolving Loans Amortized Cost Basis	1,964		290
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	52,781		130,296
Current fiscal year, charge-offs	0		0
Fiscal year before current fiscal year, charge-offs	0		0
Two year before current fiscal year, charge-offs	0		0
Three year before current fiscal year, charge-offs	0		0
Four year before current fiscal year, charge-offs	0		0
Prior, charge-offs	0		0
Revolving loans, charge-offs	0		0
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	0	0	0
Real Estate Construction - Commercial | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	8,553		49,041
Year two	23,754		53,058
Year three	11,057		24,371
Year four	5,093		1,040
Year five	1,025		31
Prior	746		735
Revolving Loans Amortized Cost Basis	1,861		187
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	52,089		128,463
Real Estate Construction - Commercial | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one			934
Year two			17
Year three			0
Year four			0
Year five			0
Prior			0
Revolving Loans Amortized Cost Basis			103
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			1,054
Real Estate Construction - Commercial | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one			710
Year two			0
Year three			0
Year four			0
Year five			0
Prior			0
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			710
Real Estate Construction - Commercial | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	64		69
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	64		69
Real Estate Construction - Commercial | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0
Year two	509
Year three	16
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	103
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	628
Real Estate Mortgage - Residential
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	9,651		65,667
Year two	55,332		121,704
Year three	125,054		63,502
Year four	61,272		48,441
Year five	47,173		7,313
Prior	30,325		20,875
Revolving Loans Amortized Cost Basis	45,919		44,687
Revolving Loans Converted to Term Loans Amortized Cost Basis	392		202
Total	375,118		372,391
Current fiscal year, charge-offs	0		0
Fiscal year before current fiscal year, charge-offs	0		0
Two year before current fiscal year, charge-offs	0		0
Three year before current fiscal year, charge-offs	0		75
Four year before current fiscal year, charge-offs	0		0
Prior, charge-offs	1		0
Revolving loans, charge-offs	0		13
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	1	0	88
Real Estate Mortgage - Residential | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	8,197		65,472
Year two	55,036		121,430
Year three	124,785		62,998
Year four	60,775		47,884
Year five	46,615		7,242
Prior	28,849		19,193
Revolving Loans Amortized Cost Basis	45,768		44,574
Revolving Loans Converted to Term Loans Amortized Cost Basis	392		202
Total	370,417		368,995
Real Estate Mortgage - Residential | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one			179
Year two			251
Year three			411
Year four			293
Year five			71
Prior			1,310
Revolving Loans Amortized Cost Basis			23
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			2,538
Real Estate Mortgage - Residential | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		16
Year two	16		0
Year three	0		0
Year four	0		129
Year five	0		0
Prior	164		126
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	180		271
Real Estate Mortgage - Residential | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		0
Year two	0		23
Year three	22		93
Year four	91		135
Year five	57		0
Prior	235		246
Revolving Loans Amortized Cost Basis	120		90
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	525		587
Real Estate Mortgage - Residential | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	1,454
Year two	280
Year three	247
Year four	406
Year five	501
Prior	1,077
Revolving Loans Amortized Cost Basis	31
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	3,996
Real Estate Mortgage - Commercial
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	21,057		116,657
Year two	133,691		219,946
Year three	252,551		224,182
Year four	233,775		84,666
Year five	82,335		27,558
Prior	66,722		41,127
Revolving Loans Amortized Cost Basis	17,521		16,229
Revolving Loans Converted to Term Loans Amortized Cost Basis	51		659
Total	807,703		731,024
Current fiscal year, charge-offs	0		0
Fiscal year before current fiscal year, charge-offs	0		0
Two year before current fiscal year, charge-offs	0		0
Three year before current fiscal year, charge-offs	0		0
Four year before current fiscal year, charge-offs	0		0
Prior, charge-offs	23		32
Revolving loans, charge-offs	0		0
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	23	5	32
Real Estate Mortgage - Commercial | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	6,390		99,081
Year two	127,095		208,699
Year three	241,478		204,789
Year four	219,924		84,363
Year five	82,076		27,085
Prior	65,824		39,941
Revolving Loans Amortized Cost Basis	17,445		16,059
Revolving Loans Converted to Term Loans Amortized Cost Basis	51		659
Total	760,283		680,676
Real Estate Mortgage - Commercial | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	12,312		15,759
Year two	0		10,978
Year three	5,876		2,737
Year four	7,947		91
Year five	0		345
Prior	0		897
Revolving Loans Amortized Cost Basis	0		70
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	26,135		30,877
Real Estate Mortgage - Commercial | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		0
Year two	710		215
Year three	213		15,944
Year four	428		0
Year five	48		45
Prior	282		289
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	1,681		16,493
Real Estate Mortgage - Commercial | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0		1,817
Year two	1,181		54
Year three	0		712
Year four	2,922		212
Year five	211		83
Prior	176		0
Revolving Loans Amortized Cost Basis	0		100
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	4,490		2,978
Real Estate Mortgage - Commercial | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	2,355
Year two	4,705
Year three	4,984
Year four	2,554
Year five	0
Prior	440
Revolving Loans Amortized Cost Basis	76
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	15,114
Installment and Other Consumer
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	1,078		7,430
Year two	5,802		6,497
Year three	5,654		2,720
Year four	2,303		1,287
Year five	1,055		987
Prior	2,173		1,803
Revolving Loans Amortized Cost Basis	80		90
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	18,145		20,814
Current fiscal year, charge-offs	0		84
Fiscal year before current fiscal year, charge-offs	3		23
Two year before current fiscal year, charge-offs	5		7
Three year before current fiscal year, charge-offs	0		0
Four year before current fiscal year, charge-offs	0		0
Prior, charge-offs	62		232
Revolving loans, charge-offs	0		1
Revolving, converted to term loan, charge-offs	0		0
Total charge-offs	70	$ 58	347
Installment and Other Consumer | Pass
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	1,078		7,430
Year two	5,802		6,497
Year three	5,654		2,720
Year four	2,299		1,287
Year five	1,055		987
Prior	2,173		1,803
Revolving Loans Amortized Cost Basis	80		90
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	18,141		$ 20,814
Installment and Other Consumer | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Year one	0
Year two	0
Year three	0
Year four	4
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	$ 4