Loans - Impaired Loan Data (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	$ 15,472	$ 20,129
With An Allowance Recorded	6,413	7,876
Loans Including Purchased Credit Impaired Loans	23,122	28,384
Recorded Investment
With No Related Allowance Recorded	14,598	19,249
With An Allowance Recorded	6,413	7,865
Loans Including Purchased Credit Impaired Loans	22,119	27,361
Related Allowance
With An Allowance Recorded	1,574	1,925
Total Impaired Loans	1,721	2,010
Average Recorded Investment
With No Related Allowance Recorded	17,506	17,376
With An Allowance Recorded	6,950	7,766
Loans Including Purchased Credit Impaired Loans	25,072	25,476
Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	1,237	379
Recorded Investment
Loans Including Purchased Credit Impaired Loans	1,108	247
Related Allowance
With An Allowance Recorded	147	85
Purchased Credit Impaired Loans	147	85
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	616	334
Residential real estate
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	1,036	1,140
With An Allowance Recorded	1,130	1,274
Loans Including Purchased Credit Impaired Loans	2,178	2,428
Recorded Investment
With No Related Allowance Recorded	1,036	1,122
With An Allowance Recorded	1,130	1,230
Loans Including Purchased Credit Impaired Loans	2,178	2,363
Related Allowance
With An Allowance Recorded	224	226
Total Impaired Loans	233	230
Average Recorded Investment
With No Related Allowance Recorded	1,075	2,142
With An Allowance Recorded	1,197	703
Loans Including Purchased Credit Impaired Loans	2,281	2,858
Residential real estate | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	12	14
Recorded Investment
Loans Including Purchased Credit Impaired Loans	12	11
Related Allowance
With An Allowance Recorded	9	4
Purchased Credit Impaired Loans	9	4
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	9	13
Commercial, financial & agricultural
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	85	42
With An Allowance Recorded	0	310
Loans Including Purchased Credit Impaired Loans	140	407
Recorded Investment
With No Related Allowance Recorded	85	40
With An Allowance Recorded	0	310
Loans Including Purchased Credit Impaired Loans	132	396
Related Allowance
With An Allowance Recorded	0	263
Total Impaired Loans	4	263
Average Recorded Investment
With No Related Allowance Recorded	43	203
With An Allowance Recorded	132	1,118
Loans Including Purchased Credit Impaired Loans	218	1,370
Commercial, financial & agricultural | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	55	55
Recorded Investment
Loans Including Purchased Credit Impaired Loans	47	46
Related Allowance
With An Allowance Recorded	4	0
Purchased Credit Impaired Loans	4	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	43	49
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	192	192
Recorded Investment
With No Related Allowance Recorded	0	0
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	96	96
Related Allowance
With An Allowance Recorded	0	0
Total Impaired Loans	96	81
Average Recorded Investment
With No Related Allowance Recorded	0	0
With An Allowance Recorded	2	0
Loans Including Purchased Credit Impaired Loans	66	113
Consumer and other | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	192	192
Recorded Investment
Loans Including Purchased Credit Impaired Loans	96	96
Related Allowance
With An Allowance Recorded	96	81
Purchased Credit Impaired Loans	96	81
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	64	113
Construction, land and land development
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	6,968	6,969
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	7,083	7,087
Recorded Investment
With No Related Allowance Recorded	6,967	6,982
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	7,058	7,076
Related Allowance
With An Allowance Recorded	0	0
Total Impaired Loans	0	0
Average Recorded Investment
With No Related Allowance Recorded	7,143	2,841
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	7,228	2,937
Construction, land and land development | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	115	118
Recorded Investment
Loans Including Purchased Credit Impaired Loans	91	94
Related Allowance
With An Allowance Recorded	0	0
Purchased Credit Impaired Loans	0	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	85	96
Commercial real estate
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	7,383	11,978
With An Allowance Recorded	5,283	6,292
Loans Including Purchased Credit Impaired Loans	13,529	18,270
Recorded Investment
With No Related Allowance Recorded	6,510	11,105
With An Allowance Recorded	5,283	6,325
Loans Including Purchased Credit Impaired Loans	12,655	17,430
Related Allowance
With An Allowance Recorded	1,350	1,436
Total Impaired Loans	1,388	1,436
Average Recorded Investment
With No Related Allowance Recorded	9,245	12,190
With An Allowance Recorded	5,619	5,945
Loans Including Purchased Credit Impaired Loans	15,279	18,198
Commercial real estate | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	863	0
Recorded Investment
Loans Including Purchased Credit Impaired Loans	862	0
Related Allowance
With An Allowance Recorded	38	0
Purchased Credit Impaired Loans	38	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	$ 415	$ 63