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Loans, Allowance for Credit Losses, and Asset Quality Information - Summary of Major Categories of Total Loans Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 6,065,626	$ 6,083,419
Unamortized net deferred loan fees	(928)	(1,704)
Total loans	$ 6,064,698	$ 6,081,715
Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	100.00%	100.00%
Total non-PPP SBA loans included in the table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 159,960	$ 171,149
Guaranteed portions of non-PPP SBA loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	33,024	48,377
Unguaranteed portions of non-PPP SBA loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	126,936	122,772
Sold portions of SBA loans with servicing retained - not included in tables above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	426,601	414,240
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 603,454	$ 648,997
Commercial, financial, and agricultural | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	10.00%	11.00%
Real estate, commercial | Real estate – construction, land development & other land loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 795,886	$ 828,549
Real estate, commercial | Real estate – construction, land development & other land loans | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	13.00%	13.00%
Real estate, commercial | Real estate – mortgage – commercial and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,234,949	$ 3,194,737
Real estate, commercial | Real estate – mortgage – commercial and other | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	53.00%	53.00%
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 1,045,167	$ 1,021,966
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	17.00%	17.00%
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 329,348	$ 331,932
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	6.00%	5.00%
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 56,822	$ 57,238
Consumer loans | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	1.00%	1.00%

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