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Loans and Asset Quality Information - Summary of Major Categories of Total Loans Outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 6,083,419	$ 4,735,013	$ 4,451,525
Unamortized net deferred loan (fees) costs	(1,704)	(3,698)	(1,941)
Total loans	$ 6,081,715	$ 4,731,315	4,453,466
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	$ 171,149	$ 169,662
Guaranteed portions of non-PPP SBA Loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	48,377	33,959
Unguaranteed portions of non-PPP SBA Loans included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	122,772	135,703
Sold portions of SBA loans with servicing retained - not included in table above
Loans and Leases Receivable Disclosure [Line Items]
Total loans	414,240	395,398
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 648,997	$ 782,549	504,271
Commercial, financial, and agricultural | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	11.00%	17.00%
Real estate, commercial | Real estate – construction, land development & other land loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 828,549	$ 570,672	530,866
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%	12.00%
Real estate, commercial | Real estate – mortgage – commercial and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,194,737	$ 2,049,203	1,917,280
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%	43.00%
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 1,021,966	$ 972,378	1,105,014
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%	21.00%
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 331,932	$ 306,256	337,922
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	5.00%	6.00%
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 57,238	$ 53,955	$ 56,172
Consumer loans | Financing Receivable | Loan Category Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Percentage	1.00%	1.00%

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