LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 17,286		$ 12,403
Individually Evaluated for Credit Loss	45,540		49,082
Collectively Evaluated for Credit Loss	140,643		126,964
Collectively Evaluated for Credit Loss	13,054,571		12,901,442
Total LHFI	13,100,111		12,950,524
Total	157,929	$ 154,685	139,367	$ 134,031	$ 129,298	$ 120,214
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	16,390		11,436
Individually Evaluated for Credit Loss	29,640		21,102
Collectively Evaluated for Credit Loss	16,155		15,202
Collectively Evaluated for Credit Loss	1,737,439		1,901,808
Total LHFI	1,767,079		1,922,910
Total	32,545	28,735	26,638	23,755	23,170	23,140
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,699		5,794
Collectively Evaluated for Credit Loss	152,611		165,734
Total LHFI	152,611		165,734
Total	5,699	5,645	5,794	5,804	5,540	5,792
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			0
Individually Evaluated for Credit Loss			0
Collectively Evaluated for Credit Loss	1,166		646
Collectively Evaluated for Credit Loss	996,002		1,088,466
Total LHFI	996,002		1,088,466
Total	1,166	625	646	665	676	885
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	896		967
Individually Evaluated for Credit Loss	906		967
Collectively Evaluated for Credit Loss	5,832		6,105
Collectively Evaluated for Credit Loss	641,901		555,068
Total LHFI	642,807		556,035
Total	6,728	6,489	7,072	10,690	5,607	4,647
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
Individually Evaluated for Credit Loss			2,020
Collectively Evaluated for Credit Loss	6,121		17,192
Collectively Evaluated for Credit Loss	614,787		640,866
Total LHFI	614,787		642,886
Total	6,121	5,101	17,192	17,241	15,343	12,828
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	870		946
Collectively Evaluated for Credit Loss	10,729		12,942
Collectively Evaluated for Credit Loss	646,973		621,451
Total LHFI	647,843		622,397
Total	10,729	10,373	12,942	12,563	12,173	12,374
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	10,558		20,812
Collectively Evaluated for Credit Loss	36,287		24,043
Collectively Evaluated for Credit Loss	3,571,994		3,468,622
Total LHFI	3,582,552		3,489,434
Total	36,287	41,136	24,043	23,298	20,376	19,488
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	1,989
Individually Evaluated for Credit Loss			0
Collectively Evaluated for Credit Loss	13,071		4,488
Collectively Evaluated for Credit Loss	1,473,809		1,312,551
Total LHFI	1,475,798		1,312,551
Total	13,071	12,037	4,488	3,565	3,481	4,743
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
Individually Evaluated for Credit Loss			0
Collectively Evaluated for Credit Loss	13,841		5,758
Collectively Evaluated for Credit Loss	973,469		867,793
Total LHFI	973,469		867,793
Total	13,841	13,897	5,758	6,306	14,377	15,132
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	1,577		3,235
Collectively Evaluated for Credit Loss	31,742		34,794
Collectively Evaluated for Credit Loss	2,245,586		2,279,083
Total LHFI	2,247,163		2,282,318
Total	$ 31,742	$ 30,647	$ 34,794	$ 30,144	$ 28,555	$ 21,185