Loans - Schedule of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Summary of loans
Gross loans	$ 18,568,438	$ 12,889,500
Unearned income	(4,991)	(4,480)
Loans, net of unearned income	18,563,447	12,885,020	$ 12,604,755
Commercial, financial, agricultural
Summary of loans
Gross loans	2,666,923	1,885,817
Loans, net of unearned income	2,666,923		1,847,762
Lease financing
Summary of loans
Gross loans	94,559	95,071
Loans, net of unearned income	89,568		102,996
Real estate – construction:
Summary of loans
Gross loans	1,339,967	1,093,653
Loans, net of unearned income	1,339,967		1,355,425
Real estate – construction: \| Residential
Summary of loans
Gross loans	380,040	256,655
Real estate – construction: \| Commercial
Summary of loans
Gross loans	959,927	836,998
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	4,874,679	3,488,877
Loans, net of unearned income	4,874,679		3,435,818
Real estate – 1-4 family mortgage: \| Primary
Summary of loans
Gross loans	3,082,720	2,428,076
Real estate – 1-4 family mortgage: \| Home equity
Summary of loans
Gross loans	722,389	544,158
Real estate – 1-4 family mortgage: \| Rental/investment
Summary of loans
Gross loans	843,334	402,938
Real estate – 1-4 family mortgage: \| Land development
Summary of loans
Gross loans	226,236	113,705
Real estate – 1-4 family mortgage: \| Land development
Summary of loans
Gross loans	226,236	113,705
Real estate – commercial mortgage:
Summary of loans
Gross loans	9,470,134	6,236,068
Loans, net of unearned income	9,470,134		5,766,478
Real estate – commercial mortgage: \| Owner-occupied
Summary of loans
Gross loans	3,288,006	1,894,679
Real estate – commercial mortgage: \| Non-owner occupied
Summary of loans
Gross loans	5,953,136	4,226,937
Real estate – commercial mortgage: \| Land development
Summary of loans
Gross loans	228,992	114,452
Installment loans to individuals
Summary of loans
Gross loans	122,176	$ 90,014
Loans, net of unearned income	$ 122,176		$ 96,276