LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 142,998	$ 122,239	$ 139,367	$ 120,214
Loans charged-off	(5,120)	(2,773)	(11,444)	(5,769)
Loans charged-off	(13,753)	(2,773)	(20,077)	(5,769)
Recoveries	2,111	1,621	4,358	3,398
Net (charge-offs) recoveries	(11,642)	(1,152)	(15,719)	(2,371)
PCL, LHFI	23,329	8,211	31,037	11,455
Balance at end of period	154,685	129,298	154,685	129,298
Loans Held for Investment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL, LHFI	14,696	8,211	22,404	11,455
1-4 Family Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans charged-off	(8,633)	0	(8,633)	0
PCL, LHFI	8,633	0	8,633	0
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	27,930	23,462	26,638	23,140
Loans charged-off	(191)	(456)	(775)	(927)
Recoveries	272	217	470	487
PCL, LHFI	724	(53)	2,402	470
Balance at end of period	28,735	23,170	28,735	23,170
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,523	5,532	5,794	5,792
Loans charged-off	(2,184)	(1,989)	(4,932)	(4,144)
Recoveries	1,447	1,221	2,952	2,538
PCL, LHFI	859	776	1,831	1,354
Balance at end of period	5,645	5,540	5,645	5,540
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	638	729	646	885
Loans charged-off	0	0	0
Recoveries	0	0	0
PCL, LHFI	(13)	(53)	(21)	(209)
Balance at end of period	625	676	625	676
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,056	5,710	7,072	4,647
Loans charged-off	0	(23)	(53)	(23)
Recoveries	23	0	52	0
PCL, LHFI	410	(80)	(582)	983
Balance at end of period	6,489	5,607	6,489	5,607
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	5,743	13,260	17,192	12,828
Loans charged-off	0		(24)	(14)
Recoveries	7	64	8	72
PCL, LHFI	(649)	2,019	(12,075)	2,457
Balance at end of period	5,101	15,343	5,101	15,343
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	10,554	11,918	12,942	12,374
Loans charged-off	(104)	(86)	(180)	(120)
Recoveries	63	75	513	122
PCL, LHFI	(140)	266	(2,902)	(203)
Balance at end of period	10,373	12,173	10,373	12,173
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	33,292	18,640	24,043	19,488
Loans charged-off	0	(58)	(2,428)	(86)
Recoveries	17	10	26	106
PCL, LHFI	7,827	1,784	19,495	868
Balance at end of period	41,136	20,376	41,136	20,376
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	9,251	2,362	4,488	4,743
Loans charged-off	0	0	0	0
Recoveries	0	2	0	5
PCL, LHFI	2,786	1,117	7,549	(1,267)
Balance at end of period	12,037	3,481	12,037	3,481
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	31,946	26,156	34,794	21,185
Loans charged-off	(8,780)	(161)	(9,191)	(455)
Recoveries	27	14	65	20
PCL, LHFI	7,454	2,546	4,979	7,805
Balance at end of period	30,647	28,555	30,647	28,555
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	12,065	14,470	5,758	15,132
Loans charged-off	(2,494)	0	(2,494)	0
Recoveries	255	18	272	48
PCL, LHFI	4,071	(111)	10,361	(803)
Balance at end of period	$ 13,897	$ 14,377	$ 13,897	$ 14,377