LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 122,239	$ 98,734	$ 120,214	$ 99,457
Loans charged-off	(2,773)	(2,277)	(5,769)	(4,519)
Recoveries	1,621	3,967	3,398	6,346
Net (charge-offs) recoveries	(1,152)	1,690	(2,371)	1,827
Provision for credit losses (PCL), LHFI	8,211	2,716	11,455	1,856
Balance at end of period	129,298	103,140	129,298	103,140
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI		6,700		9,600
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	23,462	14,951	23,140	18,939
Loans charged-off	(456)	(90)	(927)	(375)
Recoveries	217	203	487	303
Provision for credit losses (PCL), LHFI	(53)	(961)	470	(4,764)
Balance at end of period	23,170	14,103	23,170	14,103
Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI				8,200
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,532	4,872	5,792	4,774
Loans charged-off	(1,989)	(357)	(4,144)	(936)
Recoveries	1,221	452	2,538	831
Provision for credit losses (PCL), LHFI	776	172	1,354	470
Balance at end of period	5,540	5,139	5,540	5,139
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	729	2,371	885	2,708
Loans charged-off	0		0
Recoveries	0		0
Provision for credit losses (PCL), LHFI	(53)	(454)	(209)	(791)
Balance at end of period	676	1,917	676	1,917
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,710	4,077	4,647	5,348
Loans charged-off	(23)	(1,565)	(23)	(2,902)
Recoveries	0	1,079	0	2,008
Provision for credit losses (PCL), LHFI	(80)	1,372	983	509
Balance at end of period	5,607	4,963	5,607	4,963
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,260	7,351	12,828	6,079
Loans charged-off	0	(6)	(14)	(34)
Recoveries	64	344	72	1,187
Provision for credit losses (PCL), LHFI	2,019	(388)	2,457	69
Balance at end of period	15,343	7,301	15,343	7,301
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	11,918	9,867	12,374	10,310
Loans charged-off	(86)	(49)	(120)	(62)
Recoveries	75	206	122	295
Provision for credit losses (PCL), LHFI	266	14	(203)	(505)
Balance at end of period	12,173	10,038	12,173	10,038
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	18,640	32,030	19,488	37,912
Loans charged-off	(58)	0	(86)
Recoveries	10	1,474	106	1,501
Provision for credit losses (PCL), LHFI	1,784	(3,769)	868	(9,678)
Balance at end of period	20,376	29,735	20,376	29,735
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	2,362	3,640	4,743	4,713
Loans charged-off	0	(131)	0	(131)
Recoveries	2	4	5	7
Provision for credit losses (PCL), LHFI	1,117	(216)	(1,267)	(1,292)
Balance at end of period	3,481	3,297	3,481	3,297
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	26,156	5,628	21,185	2,706
Loans charged-off	(161)	(79)	(455)	(79)
Recoveries	14	4	20	10
Provision for credit losses (PCL), LHFI	2,546	6,697	7,805	9,613
Balance at end of period	28,555	12,250	28,555	12,250
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	14,470	13,947	15,132	5,968
Loans charged-off	0		0
Recoveries	18	201	48	204
Provision for credit losses (PCL), LHFI	(111)	249	(803)	8,225
Balance at end of period	$ 14,377	$ 14,397	$ 14,377	$ 14,397