LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 17,564		$ 17,687
Individually Evaluated for Credit Loss	37,962		40,288
Collectively Evaluated for Credit Loss	111,734		102,527
Collectively Evaluated for Credit Loss	12,576,005		12,163,751
Total LHFI	12,613,967		12,204,039
Total	129,298	$ 122,239	120,214	$ 103,140	$ 98,734	$ 99,457
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	8,770		9,946
Individually Evaluated for Credit Loss	21,646		24,594
Collectively Evaluated for Credit Loss	14,400		13,194
Collectively Evaluated for Credit Loss	1,861,834		1,796,665
Total LHFI	1,883,480		1,821,259
Total	23,170	23,462	23,140	14,103	14,951	18,939
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,540		5,792
Collectively Evaluated for Credit Loss	167,540		170,230
Total LHFI	167,540		170,230
Total	5,540	5,532	5,792	5,139	4,872	4,774
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	676		885
Collectively Evaluated for Credit Loss	1,111,710		1,223,863
Total LHFI	1,111,710		1,223,863
Total	676	729	885	1,917	2,371	2,708
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	968		0
Individually Evaluated for Credit Loss	968		0
Collectively Evaluated for Credit Loss	4,639		4,647
Collectively Evaluated for Credit Loss	447,292		471,930
Total LHFI	448,260		471,930
Total	5,607	5,710	4,647	4,963	4,077	5,348
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	206		121
Individually Evaluated for Credit Loss	1,529		1,558
Collectively Evaluated for Credit Loss	15,137		12,707
Collectively Evaluated for Credit Loss	647,807		689,058
Total LHFI	649,336		690,616
Total	15,343	13,260	12,828	7,301	7,351	6,079
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	459		482
Collectively Evaluated for Credit Loss	12,173		12,374
Collectively Evaluated for Credit Loss	591,830		590,308
Total LHFI	592,289		590,790
Total	12,173	11,918	12,374	10,038	9,867	10,310
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	4,084		4,841
Collectively Evaluated for Credit Loss	20,376		19,488
Collectively Evaluated for Credit Loss	3,467,644		3,273,989
Total LHFI	3,471,728		3,278,830
Total	20,376	18,640	19,488	29,735	32,030	37,912
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		0
Collectively Evaluated for Credit Loss	3,481		4,743
Collectively Evaluated for Credit Loss	954,410		742,538
Total LHFI	954,410		742,538
Total	3,481	2,362	4,743	3,297	3,640	4,713
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	7,620		7,620
Individually Evaluated for Credit Loss	7,620		7,620
Collectively Evaluated for Credit Loss	6,757		7,512
Collectively Evaluated for Credit Loss	1,065,701		1,021,306
Total LHFI	1,073,321		1,028,926
Total	14,377	14,470	15,132	14,397	13,947	5,968
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	1,656		1,193
Collectively Evaluated for Credit Loss	28,555		21,185
Collectively Evaluated for Credit Loss	2,260,237		2,183,864
Total LHFI	2,261,893		2,185,057
Total	$ 28,555	$ 26,156	$ 21,185	$ 12,250	$ 5,628	$ 2,706