Loans - Schedule of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Summary of loans
Gross loans	$ 12,609,937	$ 12,358,017
Unearned income	(5,182)	(6,787)
Loans, net of unearned income	12,604,755	12,351,230	$ 11,930,516
Commercial, financial, agricultural
Summary of loans
Gross loans	1,847,762	1,871,821
Loans, net of unearned income	1,847,762		1,729,070
Lease financing
Summary of loans
Gross loans	108,178	122,807
Loans, net of unearned income	102,996		122,370
Real estate – construction:
Summary of loans
Gross loans	1,355,425	1,333,397
Loans, net of unearned income	1,355,425		1,369,019
Real estate – construction: | Residential
Summary of loans
Gross loans	275,966	269,616
Real estate – construction: | Commercial
Summary of loans
Gross loans	1,079,459	1,063,781
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	3,435,818	3,439,919
Loans, net of unearned income	3,435,818		3,348,654
Real estate – 1-4 family mortgage: | Primary
Summary of loans
Gross loans	2,415,150	2,422,482
Real estate – 1-4 family mortgage: | Home equity
Summary of loans
Gross loans	529,803	522,688
Real estate – 1-4 family mortgage: | Rental/investment
Summary of loans
Gross loans	388,305	373,755
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	102,560	120,994
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	102,560	120,994
Real estate – commercial mortgage:
Summary of loans
Gross loans	5,766,478	5,486,550
Loans, net of unearned income	5,766,478		5,252,479
Real estate – commercial mortgage: | Owner-occupied
Summary of loans
Gross loans	1,724,601	1,648,961
Real estate – commercial mortgage: | Non-owner occupied
Summary of loans
Gross loans	3,938,351	3,733,174
Real estate – commercial mortgage: | Land development
Summary of loans
Gross loans	103,526	104,415
Installment loans to individuals
Summary of loans
Gross loans	96,276	$ 103,523
Loans, net of unearned income	$ 96,276		$ 108,924