Loans - Summary of Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of loans
Gross loans	$ 11,585,458	$ 10,024,981
Unearned income	(7,154)	(4,067)
Loans, net of unearned income	11,578,304	10,020,914
Commercial, financial, agricultural
Summary of loans
Gross loans	1,673,883	1,423,270
Loans, net of unearned income	1,673,883	1,423,270
Lease financing
Summary of loans
Gross loans	122,167	80,192
Loans, net of unearned income	115,013	76,125
Real estate – construction:
Summary of loans
Gross loans	1,330,337	1,104,896
Loans, net of unearned income	1,330,337	1,104,896
Real estate – construction: | Residential
Summary of loans
Gross loans	355,500	302,275
Real estate – construction: | Commercial
Summary of loans
Gross loans	974,837	802,621
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	3,216,263	2,724,246
Loans, net of unearned income	3,216,263	2,724,246
Real estate – 1-4 family mortgage: | Primary
Summary of loans
Gross loans	2,222,856	1,816,120
Real estate – 1-4 family mortgage: | Home equity
Summary of loans
Gross loans	501,906	474,604
Real estate – 1-4 family mortgage: | Rental/investment
Summary of loans
Gross loans	334,382	288,474
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	157,119	145,048
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	157,119	145,048
Real estate – commercial mortgage:
Summary of loans
Gross loans	5,118,063	4,549,037
Loans, net of unearned income	5,118,063	4,549,037
Real estate – commercial mortgage: | Owner-occupied
Summary of loans
Gross loans	1,539,296	1,563,351
Real estate – commercial mortgage: | Non-owner occupied
Summary of loans
Gross loans	3,452,910	2,856,947
Real estate – commercial mortgage: | Land development
Summary of loans
Gross loans	125,857	128,739
Installment loans to individuals
Summary of loans
Gross loans	124,745	143,340
Loans, net of unearned income	$ 124,745	$ 143,340