LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 13,978	$ 13,661
Individually Evaluated for Credit Loss	34,992	37,140
Collectively Evaluated for Credit Loss	153,032	146,609
Collectively Evaluated for Credit Loss	13,206,477	13,052,802
Total LHFI	13,241,469	13,089,942
Total	167,010	160,270	$ 142,998	$ 139,367
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	10,925	10,518
Individually Evaluated for Credit Loss	22,060	22,503
Collectively Evaluated for Credit Loss	14,471	16,502
Collectively Evaluated for Credit Loss	1,743,833	1,818,219
Total LHFI	1,765,893	1,840,722
Total	25,396	27,020	27,930	26,638
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,238	5,141
Collectively Evaluated for Credit Loss	157,935	156,569
Total LHFI	157,935	156,569
Total	5,238	5,141	5,523	5,794
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	1,605	1,250
Collectively Evaluated for Credit Loss	974,300	969,836
Total LHFI	974,300	969,836
Total	1,605	1,250	638	646
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	887	892
Individually Evaluated for Credit Loss	887	896
Collectively Evaluated for Credit Loss	5,643	5,355
Collectively Evaluated for Credit Loss	637,544	588,116
Total LHFI	638,431	589,012
Total	6,530	6,247	6,056	7,072
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	6,982	6,452
Collectively Evaluated for Credit Loss	599,325	587,244
Total LHFI	599,325	587,244
Total	6,982	6,452	5,743	17,192
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	502	521
Collectively Evaluated for Credit Loss	12,476	11,347
Collectively Evaluated for Credit Loss	664,920	650,029
Total LHFI	665,422	650,550
Total	12,476	11,347	10,554	12,942
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	2,166	2,251
Individually Evaluated for Credit Loss	9,742	9,783
Collectively Evaluated for Credit Loss	37,807	35,645
Collectively Evaluated for Credit Loss	3,523,100	3,523,499
Total LHFI	3,532,842	3,533,282
Total	39,973	37,896	33,292	24,043
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	268	1,904
Collectively Evaluated for Credit Loss	23,348	19,491
Collectively Evaluated for Credit Loss	1,876,191	1,631,926
Total LHFI	1,876,459	1,633,830
Total	23,348	19,491	9,251	4,488
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	9,860	13,297
Collectively Evaluated for Credit Loss	722,306	829,904
Total LHFI	722,306	829,904
Total	9,860	13,297	12,065	5,758
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	1,533	1,533
Collectively Evaluated for Credit Loss	35,602	32,129
Collectively Evaluated for Credit Loss	2,307,023	2,297,460
Total LHFI	2,308,556	2,298,993
Total	$ 35,602	$ 32,129	$ 31,946	$ 34,794