Financial Statements of Parent - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Available for sale securities	$ 1,396,549	$ 1,507,595
Loans held for investment, net of unearned income	7,950,551	8,079,745
Investment in subsidiaries:
Other assets	470,073	517,545
Total assets	16,268,129	16,466,996
Liabilities and Stockholders' Equity
Notes payable	347,667	347,145
Stockholders' equity	2,189,965	2,122,967
Total liabilities and stockholders' equity	16,268,129	16,466,996
Parent Company | Reportable Legal Entities
Assets
Cash and cash equivalents	466,738	245,696	$ 205,887
Available for sale securities	29,816	24,418
Loans held for investment, net of unearned income		10,858	9,181
Investment in subsidiaries:
Bank subsidiaries	1,469,491	1,549,450	1,533,491
Nonbank subsidiaries	420,685	457,675	427,516
Other assets	215,158	254,960	289,438
Total assets	2,601,888	2,543,057	2,465,513
Liabilities and Stockholders' Equity
Accounts payable and accrued expenses	20,845	26,658	34,569
Notes payable	364,819	367,861	370,823
Stockholders' equity	2,216,224	2,148,538	2,060,121
Total liabilities and stockholders' equity	$ 2,601,888	$ 2,543,057	$ 2,465,513