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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details) $ in Thousands		3 Months Ended
	Jan. 01, 2023 USD ($)	Mar. 31, 2023 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Unamortized discount on acquired loans		$ (32,400)		$ (11,600)
Total loans, net of deferred loan fees		7,798,963		6,665,145
Interest income on nonaccrual loans		0	$ 0
Allowance for credit losses on loans		106,396	82,069	90,967	$ 78,789
GrandSouth
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses	$ 5,610
Allowance for credit loss, increase from acquisition, non-PCD	$ 12,200
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of deferred loan fees		6,000,000		5,300,000
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		3,295	2,439	2,900	2,656
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		$ 23,073	16,013	17,718	16,249
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans		90.00%
Real Estate | Receivable Benchmark | Receivable Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage		90.00%
Hotel | Minimum
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans		10.00%
Hotel | Maximum
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans		25.00%
Non Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans		75.00%
Officers and Directors
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of deferred loan fees		$ 6,000		6,000
Number of new loans | loan		4
Financing receivable, excluding accrued interest, advances		$ 100
Repayments received from related parties		200
Officers and Directors | Unused lines of Credit
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, excluding accrued interest, available credit		1,100
Total loans			1,200
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement		1,500		800
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		14,357	$ 12,006	13,306	$ 13,506
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized discount on acquired loans		$ (4,000)		$ (4,300)

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