LHFI and ACL, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Loan Portfolio [Abstract]
Total LHFI	$ 13,241,469	$ 13,089,942
Less ACL, LHFI	167,010	160,270	$ 142,998	$ 139,367
Net LHFI	13,074,459	12,929,672
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	599,325	587,244
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	665,422	650,550
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	2,308,556	2,298,993
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,876,459	1,633,830
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	722,306	829,904
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	3,532,842	3,533,282
Less ACL, LHFI	39,973	37,896	33,292	24,043
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,765,893	1,840,722
Less ACL, LHFI	25,396	27,020	27,930	26,638
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	157,935	156,569
Less ACL, LHFI	5,238	5,141	5,523	5,794
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	974,300	969,836
Less ACL, LHFI	1,605	1,250	638	646
Other Commercial Loans and Leases [Member]
Loan Portfolio [Abstract]
Total LHFI	638,431	589,012
Less ACL, LHFI	$ 6,530	$ 6,247	$ 6,056	$ 7,072