Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
PPP loans			$ 39,000,000
Total loans	$ 6,525,286,000	$ 6,525,286,000	6,081,715,000
Unamortized discount on acquired loans	12,500,000	12,500,000	17,200,000
Interest income on nonaccrual loans		0	0
Financing receivable, revolving, converted to term loan during period	2,400,000	4,600,000
Allowance for credit losses on loans	86,587,000	86,587,000	78,789,000	$ 82,181,000	$ 63,628,000	$ 65,022,000	$ 52,388,000
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 5,200,000,000	$ 5,200,000,000	4,300,000,000
Troubled Debt Restructuring
Loans and Leases Receivable Disclosure [Line Items]
Number of loans modified as TDR with commitments to lend funds | loan	1	1
Commitment value for loans modified as TDR			0
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	$ 2,818,000	$ 2,818,000	2,656,000	2,630,000	2,369,000	2,363,000	1,478,000
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	17,586,000	$ 17,586,000	16,249,000	$ 15,450,000	$ 13,500,000	$ 14,809,000	$ 11,316,000
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		1000.00%
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	5,800,000	$ 5,800,000
Due from related parties	6,100,000	6,100,000	600,000
Advances to related parties		38,000
Repayments received from related parties		400,000
Credit Card Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	42,000,000	$ 42,000,000	37,900,000
Credit Card Loans | Receivable Benchmark | Receivable Type Concentration Risk | Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage		57.00%
Credit Card Loans | Receivable Benchmark | Receivable Type Concentration Risk | Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage		43.00%
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Presold mortgages in process of settlement	1,700,000	$ 1,700,000	1,500,000
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	12,306,000	12,306,000	13,506,000
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized discount on acquired loans	$ 4,600,000	$ 4,600,000	$ 6,000,000.0