Loans, Allowance for Credit Losses, and Asset Quality Information - Schedule of Analysis of Payment Status of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans	$ 6,064,698	$ 6,081,715
Nonaccrual loans	33,460	34,696
Unamortized net deferred loan fees	(928)	(1,704)
Total loans	6,065,626	6,083,419
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	13,908	11,763
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	295	3,263
Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	1,004
Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	6,017,963	6,032,693
Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	12,572	12,152
Total loans	603,454	648,997
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	389	377
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	105	93
Commercial, financial, and agricultural | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial, financial, and agricultural | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	590,388	636,375
Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	603,454	648,997
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	1,054	632
Total loans	795,886	828,549
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,492	4,046
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	286
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	793,340	823,585
Real estate, commercial | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	795,886	828,549
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	15,216	16,231
Total loans	3,234,949	3,194,737
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	2,294	164
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	1,496
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	3,217,439	3,176,846
Real estate, commercial | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	3,234,949	3,194,737
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	3,720	4,898
Total loans	1,045,167	1,021,966
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,739	6,571
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	20	1,488
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	1,032,688	1,009,009
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,045,167	1,021,966
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	807	694
Total loans	329,348	331,932
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	891	489
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	36	124
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	718
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	327,614	329,907
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	329,348	331,932
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	91	89
Total loans	56,822	57,238
Consumer loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	103	116
Consumer loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	134	62
Consumer loans | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans	0	0
Consumer loans | Accruing Current
Financing Receivable, Past Due [Line Items]
Loans	56,494	56,971
Consumer loans | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total loans	$ 56,822	$ 57,238