Loans - Impaired Loan Data (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		$ 15,598	$ 15,485
With An Allowance Recorded		9,650	9,325
Loans Including Purchased Credit Impaired Loans		25,756	24,957
Impaired Balance
With No Related Allowance Recorded		14,828	14,674
With An Allowance Recorded		9,554	9,134
Loans Including Purchased Credit Impaired Loans		24,639	23,955
Related Allowance
With An Allowance Recorded		2,839	3,149
Total Impaired Loans		2,934	3,155
Average Recorded Investment
With No Related Allowance Recorded	$ 18,818	14,751
With An Allowance Recorded	5,067	9,344
Loans Including Purchased Credit Impaired Loans	24,071	24,336
Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		508	147
Impaired Balance
Loans Including Purchased Credit Impaired Loans		257	147
Related Allowance
Purchased Credit Impaired Loans		95	6
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	186	241
Construction, land and land development
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		66	67
With An Allowance Recorded		0	0
Loans Including Purchased Credit Impaired Loans		184	132
Impaired Balance
With No Related Allowance Recorded		66	67
With An Allowance Recorded		0	0
Loans Including Purchased Credit Impaired Loans		148	132
Related Allowance
With An Allowance Recorded		0	0
Total Impaired Loans		0	0
Average Recorded Investment
With No Related Allowance Recorded	168	66
With An Allowance Recorded	80	0
Loans Including Purchased Credit Impaired Loans	328	140
Construction, land and land development | Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		118	65
Impaired Balance
Loans Including Purchased Credit Impaired Loans		82	65
Related Allowance
Purchased Credit Impaired Loans		0	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	80	74
Residential real estate
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		2,466	2,706
With An Allowance Recorded		519	757
Loans Including Purchased Credit Impaired Loans		3,003	3,474
Impaired Balance
With No Related Allowance Recorded		2,461	2,711
With An Allowance Recorded		520	760
Loans Including Purchased Credit Impaired Loans		2,992	3,482
Related Allowance
With An Allowance Recorded		115	137
Total Impaired Loans		125	143
Average Recorded Investment
With No Related Allowance Recorded	3,693	2,586
With An Allowance Recorded	367	640
Loans Including Purchased Credit Impaired Loans	4,084	3,234
Residential real estate | Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		18	11
Impaired Balance
Loans Including Purchased Credit Impaired Loans		11	11
Related Allowance
Purchased Credit Impaired Loans		10	6
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	24	8
Commercial, financial, & agricultural
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		289	257
With An Allowance Recorded		752	2,189
Loans Including Purchased Credit Impaired Loans		1,102	2,483
Impaired Balance
With No Related Allowance Recorded		289	257
With An Allowance Recorded		749	1,989
Loans Including Purchased Credit Impaired Loans		1,080	2,283
Related Allowance
With An Allowance Recorded		702	1,073
Total Impaired Loans		702	1,073
Average Recorded Investment
With No Related Allowance Recorded	910	273
With An Allowance Recorded	722	1,369
Loans Including Purchased Credit Impaired Loans	1,679	1,681
Commercial, financial, & agricultural | Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		61	37
Impaired Balance
Loans Including Purchased Credit Impaired Loans		42	37
Related Allowance
Purchased Credit Impaired Loans		0	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	47	39
Consumer and other
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		0	0
With An Allowance Recorded		0	0
Loans Including Purchased Credit Impaired Loans		188	0
Impaired Balance
With No Related Allowance Recorded		0	0
With An Allowance Recorded		0	0
Loans Including Purchased Credit Impaired Loans		86	0
Related Allowance
With An Allowance Recorded		0	0
Total Impaired Loans		85	0
Average Recorded Investment
With No Related Allowance Recorded	123	0
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	123	85
Consumer and other | Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		188	0
Impaired Balance
Loans Including Purchased Credit Impaired Loans		86	0
Related Allowance
Purchased Credit Impaired Loans		85	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	85
Commercial Real Estate Portfolio Segment
Unpaid Contractual Principal Balance
With No Related Allowance Recorded		12,777	12,455
With An Allowance Recorded		8,379	6,379
Loans Including Purchased Credit Impaired Loans		21,279	18,868
Impaired Balance
With No Related Allowance Recorded		12,012	11,639
With An Allowance Recorded		8,285	6,385
Loans Including Purchased Credit Impaired Loans		20,333	18,058
Related Allowance
With An Allowance Recorded		2,022	1,939
Total Impaired Loans		2,022	1,939
Average Recorded Investment
With No Related Allowance Recorded	13,924	11,826
With An Allowance Recorded	3,898	7,335
Loans Including Purchased Credit Impaired Loans	17,857	19,196
Commercial Real Estate Portfolio Segment | Financial Asset Acquired with Credit Deterioration
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans		123	34
Impaired Balance
Loans Including Purchased Credit Impaired Loans		36	34
Related Allowance
Purchased Credit Impaired Loans		0	$ 0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	$ 35	$ 35