Loans - Schedule of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Summary of loans
Gross loans	$ 19,030,306	$ 12,889,500
Unearned income	(4,785)	(4,480)
Loans, net of unearned income	19,025,521	12,885,020
Commercial, financial, agricultural
Summary of loans
Gross loans	2,760,490	1,885,817
Lease financing
Summary of loans
Gross loans	78,964	95,071
Real estate – construction:
Summary of loans
Gross loans	1,527,490	1,093,653
Real estate – construction: | Residential
Summary of loans
Gross loans	404,651	256,655
Real estate – construction: | Commercial
Summary of loans
Gross loans	1,122,839	836,998
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	4,882,612	3,488,877
Real estate – 1-4 family mortgage: | Primary
Summary of loans
Gross loans	3,061,356	2,428,076
Real estate – 1-4 family mortgage: | Home equity
Summary of loans
Gross loans	739,786	544,158
Real estate – 1-4 family mortgage: | Rental/investment
Summary of loans
Gross loans	841,515	402,938
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	239,955	113,705
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	239,955	113,705
Real estate – commercial mortgage:
Summary of loans
Gross loans	9,665,075	6,236,068
Real estate – commercial mortgage: | Owner-occupied
Summary of loans
Gross loans	3,321,186	1,894,679
Real estate – commercial mortgage: | Non-owner occupied
Summary of loans
Gross loans	6,120,677	4,226,937
Real estate – commercial mortgage: | Land development
Summary of loans
Gross loans	223,212	114,452
Installment loans to individuals
Summary of loans
Gross loans	$ 115,675	$ 90,014