LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 154,685	$ 129,298	$ 139,367	$ 120,214
Loans charged-off	(7,142)	(7,496)	(18,586)	(13,265)
Loans charged-off	(7,142)	(7,496)	(27,219)	(13,265)
Recoveries	2,463	3,907	6,821	7,305
Net (charge-offs) recoveries	(4,679)	(3,589)	(20,398)	(5,960)
PCL, LHFI	7,923	8,322	38,960	19,777
Balance at end of period	157,929	134,031	157,929	134,031
Loans Held for Investment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL, LHFI	7,923	8,322	30,327	19,777
1-4 Family Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans charged-off	0	0	(8,633)	0
PCL, LHFI	0	0	8,633	0
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	28,735	23,170	26,638	23,140
Loans charged-off	(3,611)	(635)	(4,386)	(1,562)
Recoveries	193	267	663	754
PCL, LHFI	7,228	953	9,630	1,423
Balance at end of period	32,545	23,755	32,545	23,755
Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL, LHFI		4,600		5,400
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,645	5,540	5,794	5,792
Loans charged-off	(2,690)	(2,421)	(7,622)	(6,565)
Recoveries	1,496	1,337	4,448	3,875
PCL, LHFI	1,248	1,348	3,079	2,702
Balance at end of period	5,699	5,804	5,699	5,804
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	625	676	646	885
Loans charged-off	0	0	0
Recoveries	0	0	0
PCL, LHFI	541	(11)	520	(220)
Balance at end of period	1,166	665	1,166	665
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,489	5,607	7,072	4,647
Loans charged-off	0	(9)	(53)	(32)
Recoveries	0	0	52	0
PCL, LHFI	239	(5,092)	(343)	6,075
Balance at end of period	6,728	10,690	6,728	10,690
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	5,101	15,343	17,192	12,828
Loans charged-off	(8)	(228)	(32)	(242)
Recoveries	614	22	622	94
PCL, LHFI	414	2,104	(11,661)	4,561
Balance at end of period	6,121	17,241	6,121	17,241
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	10,373	12,173	12,942	12,374
Loans charged-off	(201)	(110)	(381)	(230)
Recoveries	55	43	568	165
PCL, LHFI	502	457	(2,400)	254
Balance at end of period	10,729	12,563	10,729	12,563
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	41,136	20,376	24,043	19,488
Loans charged-off	0	(192)	(2,428)	(278)
Recoveries	20	2,216	46	2,322
PCL, LHFI	(4,869)	898	14,626	1,766
Balance at end of period	36,287	23,298	36,287	23,298
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	12,037	3,481	4,488	4,743
Loans charged-off	0	0	0	0
Recoveries	0	0	0	5
PCL, LHFI	1,034	84	8,583	(1,183)
Balance at end of period	13,071	3,565	13,071	3,565
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	30,647	28,555	34,794	21,185
Loans charged-off	(632)	(448)	(9,823)	(903)
Recoveries	16	7	81	27
PCL, LHFI	1,711	2,030	6,690	9,835
Balance at end of period	31,742	30,144	31,742	30,144
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,897	14,377	5,758	15,132
Loans charged-off	0	(3,453)	(2,494)	(3,453)
Recoveries	69	15	341	63
PCL, LHFI	(125)	(4,633)	10,236	(5,436)
Balance at end of period	$ 13,841	$ 6,306	$ 13,841	$ 6,306