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Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)		9 Months Ended
	Jan. 01, 2023 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Unamortized discount on acquired loans		$ (26,500,000)			$ (11,600,000)
Total loans, net of deferred loan fees		$ 8,027,037,000			$ 6,665,145,000
Number of loans to debtors with nonperforming loans | loan		2			1
Nonperforming loans, commitment to lend		$ 100,000
Interest income on nonaccrual loans		0	$ 0
Non accrual individually evaluated loan threshold		500,000
Collateral dependent individually evaluated loan threshold		500,000
Allowance for credit losses on loans		108,198,000	86,587,000	$ 109,230,000	$ 90,967,000	$ 82,181,000	$ 78,789,000
GrandSouth
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses	$ 5,610,000
Allowance for credit loss, increase from acquisition, non-PCD	$ 12,200,000
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Total loans, net of deferred loan fees		6,400,000,000			5,300,000,000
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		3,010,000	2,818,000	2,688,000	2,900,000	2,630,000	2,656,000
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		$ 22,444,000	17,586,000	$ 23,442,000	17,718,000	$ 15,450,000	16,249,000
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Threshold percentage to write-off nonaccrual loans		90.00%
Real Estate | Receivable Benchmark | Collateral Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage		88.00%
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		$ 5,500,000			6,000,000
Number of new loans | loan		2
Financing receivable, excluding accrued interest, advances		$ 45,000
Repayments received from related parties		500,000
Officers and Directors | Unused lines of Credit
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, excluding accrued interest, available credit		1,300,000			1,200,000
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement		3,200,000			800,000
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans		11,819,000	$ 12,306,000		13,306,000		$ 13,506,000
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized discount on acquired loans		$ (3,600,000)			$ (4,300,000)

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