Loans, Allowance for Credit Losses, and Asset Quality Information - Schedule of Analysis of Payment Status of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans	$ 6,243,170	$ 6,081,715
Nonaccrual loans	28,715	34,696
Unamortized net deferred loan fees	(803)	(1,704)
Total	6,243,973	6,083,419
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	8,400	11,763
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,336	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	6,205,522	6,032,693
Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	11,442	12,152
Total	596,874	648,997
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	817	377
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	110	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	584,505	636,375
Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total	596,874	648,997
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	1,133	632
Total	824,723	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	3,678	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	819,912	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	824,723	828,549
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	11,920	16,231
Total	3,338,322	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	688	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	3,325,714	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	3,338,322	3,194,737
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	3,279	4,898
Total	1,097,810	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	2,202	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	974	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	1,091,355	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	1,097,810	1,021,966
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	797	694
Total	325,617	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	879	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	172	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	323,769	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	325,617	331,932
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	144	89
Total	60,627	57,238
Consumer loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	136	116
Consumer loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	80	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	60,267	56,971
Consumer loans | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Past Due [Line Items]
Total	$ 60,627	$ 57,238