Allowance for Loan Losses - Segregated by Class of Loan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 12,127	$ 6,863
Charge-offs	(26)	(513)
Recoveries	92	78
Provision	500	1,956
Ending balance	12,693	8,384
Period end amount allocated to
Individually evaluated for impairment	1,588		$ 1,925
Collectively evaluated for impairment	10,915		10,117
Purchase credit impaired	1,588		1,925
Loans
Individually evaluated for impairment	25,243		27,114
Collectively evaluated for impairment	1,036,692		1,032,142
Purchase credit impaired	26,083		27,361
Loans	1,062,775		1,059,503
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,278	980
Charge-offs	0	(64)
Recoveries	66	4
Provision	67	283
Ending balance	2,411	1,203
Period end amount allocated to
Individually evaluated for impairment	229		226
Collectively evaluated for impairment	2,172		2,048
Purchase credit impaired	229		226
Loans
Individually evaluated for impairment	2,300		2,352
Collectively evaluated for impairment	175,910		180,658
Purchase credit impaired	2,301		2,363
Loans	178,211		183,021
Commercial, financial & agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,713	1,657
Charge-offs	(15)	(68)
Recoveries	3	1
Provision	(35)	190
Ending balance	1,666	1,780
Period end amount allocated to
Individually evaluated for impairment	38		263
Collectively evaluated for impairment	1,528		1,450
Purchase credit impaired	38		263
Loans
Individually evaluated for impairment	89		350
Collectively evaluated for impairment	210,199		212,984
Purchase credit impaired	116		396
Loans	210,315		213,380
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	243	103
Charge-offs	(11)	(351)
Recoveries	8	55
Provision	195	419
Ending balance	435	226
Period end amount allocated to
Individually evaluated for impairment	6		0
Collectively evaluated for impairment	429		162
Purchase credit impaired	6		0
Loans
Individually evaluated for impairment	6		0
Collectively evaluated for impairment	20,196		21,522
Purchase credit impaired	6		96
Loans	20,202		21,618
Purchase credit impaired
Period end amount allocated to
Purchase credit impaired	190		85
Loans
Purchase credit impaired	840		247
Purchase credit impaired | Residential real estate
Period end amount allocated to
Purchase credit impaired	10		4
Loans
Purchase credit impaired	1		11
Purchase credit impaired | Commercial, financial & agricultural
Period end amount allocated to
Purchase credit impaired	100		0
Loans
Purchase credit impaired	27		46
Purchase credit impaired | Consumer and other
Period end amount allocated to
Purchase credit impaired	0		81
Loans
Purchase credit impaired	0		96
Construction, land and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,013	215
Charge-offs	0	0
Recoveries	15	13
Provision	25	126
Ending balance	1,053	354
Period end amount allocated to
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,015		1,013
Purchase credit impaired	0		0
Loans
Individually evaluated for impairment	7,480		6,982
Collectively evaluated for impairment	108,439		114,017
Purchase credit impaired	7,528		7,076
Loans	115,967		121,093
Construction, land and land development | Purchase credit impaired
Period end amount allocated to
Purchase credit impaired	38		0
Loans
Purchase credit impaired	48		94
Other commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	6,880	3,908
Charge-offs	0	(30)
Recoveries	0	5
Provision	248	938
Ending balance	7,128	$ 4,821
Period end amount allocated to
Individually evaluated for impairment	1,315		1,436
Collectively evaluated for impairment	5,771		5,444
Purchase credit impaired	1,315		1,436
Loans
Individually evaluated for impairment	15,368		17,430
Collectively evaluated for impairment	521,948		502,961
Purchase credit impaired	16,132		17,430
Loans	538,080		520,391
Other commercial real estate | Purchase credit impaired
Period end amount allocated to
Purchase credit impaired	42		0
Loans
Purchase credit impaired	$ 764		$ 0