LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 19,855,253	$ 15,874,258
Financing receivable, nonaccrual, interest income	0	0
Balance	41,773	52,078
Loans modified that are not troubled debt restructurings	350,700	408,900
Proceeds from sales of other loans held for sale	0	156,803	$ 0
Loans charged off	33,075	21,616	54,464
Loans held for sale	392,078	1,254,632
Release of provision for loan losses	(52,610)	35,081	(125,488)
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,679,403	1,875,993
Balance	7,128	2,613
Loans charged off	18,635	7,760	10,647
Release of provision for loan losses	(21,307)	(12,071)	(8,963)
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	7,604,867	6,834,917
Balance	15,168	33,332
Loans charged off	3,574	1,852	27,504
Release of provision for loan losses	7,049	9,784	(78,210)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	384,037	191,298
Loans charged off	4,926	6,248	5,642
Release of provision for loan losses	(3,360)	(7,330)	3,831
Loans Excluding Purchased Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	40,200	76,600
Previous charge-offs	646	654
Allowance for loan losses allocated to troubled debt restructurings	2,600	10,500
Troubled debt restructurings principal balances	4,622	19,661
Loans Excluding Purchased Loan | Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	833	401
Loans Excluding Purchased Loan | Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	800	16,197
Loans Excluding Purchased Loan | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	0	7
Loans Excluding Purchased Loan | Financing Receivables, 1 to 29 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	4,128	2,292
Loans Excluding Purchased Loan | Financing Receivables, 1 to 29 Days Past Due | Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	0	35
Loans Excluding Purchased Loan | Financing Receivables, 1 to 29 Days Past Due | Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	7	0
Loans Excluding Purchased Loan | Financing Receivables, 1 to 29 Days Past Due | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings principal balances	2	5
Cash Value Life Insurance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase price	472,300
Increase in allowance for credit losses	1,800
Hotel Loans | Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of other loans held for sale			87,500
Loans charged off			17,200
Loss on sale of loans			386
Held For Sale Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged off			1,600
Loans held for sale			165,900
Release of provision for loan losses			$ 6,700
9
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 0	$ 0