Loans and Allowance for Credit Losses - Schedule of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 11,541,912	$ 11,444,216
Add: Unearned income	(9,342)	(9,611)
Loans, held for investment	11,532,570	11,434,605
Loans held for sale	29,457	54,119
Total loans and leases	11,562,027	11,488,724
Related Party
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, held for investment	305,700
Total commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	7,103,839	7,062,565
Construction and development
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	512,681	570,749
Commercial, financial & agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,740,689	1,761,287
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	4,850,469	4,730,529
Commercial real estate | Non-owner occupied CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	3,267,008	3,150,269
Commercial real estate | Owner occupied CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,583,461	1,580,260
Total residential and consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	4,438,073	4,381,651
Residential real estate | Residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	3,423,146	3,321,101
Residential real estate | Home equity lines of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	422,737	410,845
Consumer | Consumer credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	93,171	98,310
Consumer | Other consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 499,019	$ 551,395