Loans - Impaired Loan Data (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	$ 7,105	$ 8,298
With An Allowance Recorded	2,645	1,115
Loans Including Purchased Credit Impaired Loans	9,945	11,612
Recorded Investment
With No Related Allowance Recorded	6,440	7,503
With An Allowance Recorded	2,787	1,256
Loans Including Purchased Credit Impaired Loans	9,227	10,748
Related Allowance
With An Allowance Recorded	427	256
Total Impaired Loans	524	376
Average Recorded Investment
With No Related Allowance Recorded	9,085	13,563
With An Allowance Recorded	4,010	5,538
Loans Including Purchased Credit Impaired Loans	14,545	20,068
Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	195	2,199
Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	1,989
Related Allowance
With An Allowance Recorded	97	120
Purchased Credit Impaired Loans	97	120
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	1,450	967
Residential real estate
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	1,022	958
With An Allowance Recorded	1,297	685
Loans Including Purchased Credit Impaired Loans	2,322	1,647
Recorded Investment
With No Related Allowance Recorded	1,058	997
With An Allowance Recorded	1,406	773
Loans Including Purchased Credit Impaired Loans	2,464	1,770
Related Allowance
With An Allowance Recorded	123	108
Total Impaired Loans	124	114
Average Recorded Investment
With No Related Allowance Recorded	1,071	1,083
With An Allowance Recorded	1,022	1,029
Loans Including Purchased Credit Impaired Loans	2,099	2,119
Residential real estate | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	3	4
Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	0
Related Allowance
With An Allowance Recorded	1	6
Purchased Credit Impaired Loans	1	6
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	6	7
Commercial, financial & agricultural
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	99	75
With An Allowance Recorded	180	0
Loans Including Purchased Credit Impaired Loans	279	75
Recorded Investment
With No Related Allowance Recorded	99	75
With An Allowance Recorded	198	0
Loans Including Purchased Credit Impaired Loans	297	75
Related Allowance
With An Allowance Recorded	163	0
Total Impaired Loans	163	0
Average Recorded Investment
With No Related Allowance Recorded	85	56
With An Allowance Recorded	50	79
Loans Including Purchased Credit Impaired Loans	166	170
Commercial, financial & agricultural | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	0	0
Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	0
Related Allowance
With An Allowance Recorded	0	0
Purchased Credit Impaired Loans	0	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	31	35
Consumer and other
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	2	0
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	194	192
Recorded Investment
With No Related Allowance Recorded	2	0
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	2	73
Related Allowance
With An Allowance Recorded	0	0
Total Impaired Loans	96	96
Average Recorded Investment
With No Related Allowance Recorded	1	0
With An Allowance Recorded	0	1
Loans Including Purchased Credit Impaired Loans	145	73
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	0	73
Related Allowance
With An Allowance Recorded	96	96
Purchased Credit Impaired Loans	96	96
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	144	72
Construction, land and land development
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	0	62
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	0	62
Recorded Investment
With No Related Allowance Recorded	0	62
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	0	62
Related Allowance
With An Allowance Recorded	0	0
Total Impaired Loans	0	0
Average Recorded Investment
With No Related Allowance Recorded	1,773	4,311
With An Allowance Recorded	0	0
Loans Including Purchased Credit Impaired Loans	1,803	4,362
Construction, land and land development | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	0	0
Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	0
Related Allowance
With An Allowance Recorded	0	0
Purchased Credit Impaired Loans	0	0
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	30	51
Commercial real estate
Unpaid Contractual Principal Balance
With No Related Allowance Recorded	5,982	7,203
With An Allowance Recorded	1,168	430
Loans Including Purchased Credit Impaired Loans	7,150	9,636
Recorded Investment
With No Related Allowance Recorded	5,281	6,369
With An Allowance Recorded	1,183	483
Loans Including Purchased Credit Impaired Loans	6,464	8,768
Related Allowance
With An Allowance Recorded	141	148
Total Impaired Loans	141	166
Average Recorded Investment
With No Related Allowance Recorded	6,155	8,113
With An Allowance Recorded	2,938	4,429
Loans Including Purchased Credit Impaired Loans	10,332	13,344
Commercial real estate | Purchase credit impaired
Unpaid Contractual Principal Balance
Loans Including Purchased Credit Impaired Loans	0	2,003
Recorded Investment
Loans Including Purchased Credit Impaired Loans	0	1,916
Related Allowance
With An Allowance Recorded	0	18
Purchased Credit Impaired Loans	0	18
Average Recorded Investment
Loans Including Purchased Credit Impaired Loans	$ 1,239	$ 802