Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Credit quality categories
Total	$ 1,560,331	$ 1,391,846
Pass
Credit quality categories
Total	1,545,138	1,370,803
Special Mention
Credit quality categories
Total	4,746	7,302
Substandard
Credit quality categories
Total	10,447	13,741
Commercial, financial, and agricultural
Credit quality categories
Total	173,365	163,285
Commercial, financial, and agricultural | Pass
Credit quality categories
Total	171,416	160,899
Commercial, financial, and agricultural | Special Mention
Credit quality categories
Total	152	234
Commercial, financial, and agricultural | Substandard
Credit quality categories
Total	1,797	2,152
Consumer automobile
Credit quality categories
Total	159,681	139,408
Consumer automobile | Pass
Credit quality categories
Total	159,681	139,408
Consumer automobile | Special Mention
Credit quality categories
Total	0	0
Consumer automobile | Substandard
Credit quality categories
Total	0	0
Other consumer installment loans
Credit quality categories
Total	9,811	9,277
Other consumer installment loans | Pass
Credit quality categories
Total	9,811	9,257
Other consumer installment loans | Special Mention
Credit quality categories
Total	0	0
Other consumer installment loans | Substandard
Credit quality categories
Total	0	20
Residential | Real Estate Mortgages
Credit quality categories
Total	683,242	595,847
Residential | Real Estate Mortgages | Pass
Credit quality categories
Total	680,296	592,570
Residential | Real Estate Mortgages | Special Mention
Credit quality categories
Total	234	284
Residential | Real Estate Mortgages | Substandard
Credit quality categories
Total	2,712	2,993
Commercial | Real Estate Mortgages
Credit quality categories
Total	485,538	446,734
Commercial | Real Estate Mortgages | Pass
Credit quality categories
Total	475,341	432,158
Commercial | Real Estate Mortgages | Special Mention
Credit quality categories
Total	4,360	6,108
Commercial | Real Estate Mortgages | Substandard
Credit quality categories
Total	5,837	8,468
Construction | Real Estate Mortgages
Credit quality categories
Total	48,694	37,295
Construction | Real Estate Mortgages | Pass
Credit quality categories
Total	48,593	36,511
Construction | Real Estate Mortgages | Special Mention
Credit quality categories
Total	0	676
Construction | Real Estate Mortgages | Substandard
Credit quality categories
Total	$ 101	$ 108