Loans - Age Analysis of Past Due Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans	$ 1,309,860	$ 1,059,503
Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	950,696	974,573
Nonaccrual Loans	8,817	6,610
Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	359,164	84,930
Nonaccrual Loans	3,429	2,518
30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	899	2,408
30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,878	684
90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	899	2,408
Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,878	684
Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	940,980	965,555
Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	352,857	81,728
Construction, land and land development
Financing Receivable, Past Due [Line Items]
Loans	152,991	121,093
Other commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	752,633	520,391
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	905,624	641,484
Commercial real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	645,316	587,022
Nonaccrual Loans	4,476	2,625
Commercial real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	260,308	54,462
Nonaccrual Loans	1,358	2,185
Commercial real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	118	1,543
Commercial real estate | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,688	544
Commercial real estate | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	118	1,543
Commercial real estate | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,688	544
Commercial real estate | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	640,722	582,854
Commercial real estate | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	256,262	51,733
Commercial real estate | Construction, land and land development
Financing Receivable, Past Due [Line Items]
Loans	152,991	121,093
Commercial real estate | Construction, land and land development | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	101,433	109,577
Nonaccrual Loans	46	80
Commercial real estate | Construction, land and land development | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	51,558	11,516
Nonaccrual Loans	8	117
Commercial real estate | Construction, land and land development | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	59	1,314
Commercial real estate | Construction, land and land development | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,688	0
Commercial real estate | Construction, land and land development | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Construction, land and land development | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Construction, land and land development | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	59	1,314
Commercial real estate | Construction, land and land development | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	2,688	0
Commercial real estate | Construction, land and land development | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	101,328	108,183
Commercial real estate | Construction, land and land development | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	48,862	11,399
Commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	752,633	520,391
Commercial real estate | Other commercial real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	543,883	477,445
Nonaccrual Loans	4,430	2,545
Commercial real estate | Other commercial real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	208,750	42,946
Nonaccrual Loans	1,350	2,068
Commercial real estate | Other commercial real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	59	229
Commercial real estate | Other commercial real estate | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	544
Commercial real estate | Other commercial real estate | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Other commercial real estate | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial real estate | Other commercial real estate | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	59	229
Commercial real estate | Other commercial real estate | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	544
Commercial real estate | Other commercial real estate | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	539,394	474,671
Commercial real estate | Other commercial real estate | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	207,400	40,334
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans	218,224	183,021
Residential real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	163,750	167,714
Nonaccrual Loans	3,582	2,873
Residential real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	54,474	15,307
Nonaccrual Loans	1,790	85
Residential real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	579	667
Residential real estate | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	76	15
Residential real estate | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential real estate | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	579	667
Residential real estate | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	76	15
Residential real estate | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	159,589	164,174
Residential real estate | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	52,608	15,207
Commercial, financial & agricultural
Financing Receivable, Past Due [Line Items]
Loans	166,228	213,380
Commercial, financial & agricultural | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	125,213	200,800
Nonaccrual Loans	675	1,010
Commercial, financial & agricultural | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	41,015	12,580
Nonaccrual Loans	47	55
Commercial, financial & agricultural | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	132	150
Commercial, financial & agricultural | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	97	125
Commercial, financial & agricultural | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial, financial & agricultural | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial, financial & agricultural | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	132	150
Commercial, financial & agricultural | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	97	125
Commercial, financial & agricultural | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	124,406	199,640
Commercial, financial & agricultural | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	40,871	12,400
Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	19,784	21,618
Consumer and other | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	16,417	19,037
Nonaccrual Loans	84	102
Consumer and other | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	3,367	2,581
Nonaccrual Loans	234	193
Consumer and other | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	70	48
Consumer and other | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	17	0
Consumer and other | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer and other | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer and other | Total Accruing Loans Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	70	48
Consumer and other | Total Accruing Loans Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	17	0
Consumer and other | Current Loans | Legacy Loans
Financing Receivable, Past Due [Line Items]
Loans	16,263	18,887
Consumer and other | Current Loans | Purchased Loans
Financing Receivable, Past Due [Line Items]
Loans	$ 3,116	$ 2,388