Loans, Allowance for Credit Losses, and Asset Quality Information - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
PPP loans	$ 15,600,000	$ 39,000,000
Unamortized net deferred loan fees	928,000	1,704,000
Total loans	6,064,698,000	6,081,715,000
Loans pledged as collateral	5,400,000,000	4,300,000,000
Unamortized discount on acquired loans	15,600,000	17,200,000
Interest income on nonaccrual loans	0	0
Net book balance of individually evaluated loans on nonaccrual, threshold amount for designation as collateral dependent loans	350,000
Allowance for credit losses on loans	$ 82,069,000	78,789,000	$ 65,849,000	$ 52,388,000
Troubled Debt Restructuring
Loans and Leases Receivable Disclosure [Line Items]
Number of loans modified as TDR with commitments to lend funds | loan	2
Commitment value for loans modified as TDR		0
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	$ 2,439,000	2,656,000	2,297,000	1,478,000
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	$ 16,013,000	16,249,000	$ 13,606,000	$ 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 | Collateral Type Concentration Risk
Loans and Leases Receivable Disclosure [Line Items]
Concentration risk percentage	89.00%
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	$ 5,800,000
Due from related parties	6,500,000	600,000
Advances to related parties	36,000
Repayments received from related parties	21,000
Credit Card Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 38,800,000	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	$ 1,000,000	1,500,000
Unfunded Loan Commitment
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses on loans	12,006,000	13,506,000
SBA PPP loans
Loans and Leases Receivable Disclosure [Line Items]
Unamortized net deferred loan fees	1,300,000	2,600,000
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Remaining unaccreted discount	$ 5,900,000	$ 6,000,000