LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 12,378		$ 12,403
Individually Evaluated for Credit Loss	27,355		49,082
Collectively Evaluated for Credit Loss	142,307		126,964
Collectively Evaluated for Credit Loss	13,128,063		12,901,442
Total LHFI	13,155,418		12,950,524
Total	154,685	$ 142,998	139,367	$ 129,298	$ 122,239	$ 120,214
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	11,491		11,436
Individually Evaluated for Credit Loss	14,812		21,102
Collectively Evaluated for Credit Loss	17,244		15,202
Collectively Evaluated for Credit Loss	1,865,795		1,901,808
Total LHFI	1,880,607		1,922,910
Total	28,735	27,930	26,638	23,170	23,462	23,140
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,645		5,794
Collectively Evaluated for Credit Loss	156,709		165,734
Total LHFI	156,709		165,734
Total	5,645	5,523	5,794	5,540	5,532	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	625		646
Collectively Evaluated for Credit Loss	1,053,015		1,088,466
Total LHFI	1,053,015		1,088,466
Total	625	638	646	676	729	885
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	887		967
Individually Evaluated for Credit Loss	887		967
Collectively Evaluated for Credit Loss	5,602		6,105
Collectively Evaluated for Credit Loss	603,318		555,068
Total LHFI	604,205		556,035
Total	6,489	6,056	7,072	5,607	5,710	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	5,101		17,192
Collectively Evaluated for Credit Loss	616,528		640,866
Total LHFI	616,528		642,886
Total	5,101	5,743	17,192	15,343	13,260	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	907		946
Collectively Evaluated for Credit Loss	10,373		12,942
Collectively Evaluated for Credit Loss	641,858		621,451
Total LHFI	642,765		622,397
Total	10,373	10,554	12,942	12,173	11,918	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	9,730		20,812
Collectively Evaluated for Credit Loss	41,136		24,043
Collectively Evaluated for Credit Loss	3,588,917		3,468,622
Total LHFI	3,598,647		3,489,434
Total	41,136	33,292	24,043	20,376	18,640	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			0
Collectively Evaluated for Credit Loss	12,037		4,488
Collectively Evaluated for Credit Loss	1,344,968		1,312,551
Total LHFI	1,344,968		1,312,551
Total	12,037	9,251	4,488	3,481	2,362	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	13,897		5,758
Collectively Evaluated for Credit Loss	1,022,444		867,793
Total LHFI	1,022,444		867,793
Total	13,897	12,065	5,758	14,377	14,470	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	1,019		3,235
Collectively Evaluated for Credit Loss	30,647		34,794
Collectively Evaluated for Credit Loss	2,234,511		2,279,083
Total LHFI	2,235,530		2,282,318
Total	$ 30,647	$ 31,946	$ 34,794	$ 28,555	$ 26,156	$ 21,185