LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 129,298	$ 103,140	$ 120,214	$ 99,457
Loans charged-off	(7,496)	(2,920)	(13,265)	(7,439)
Recoveries	3,907	1,911	7,305	8,257
Net (charge-offs) recoveries	(3,589)	(1,009)	(5,960)	818
Provision for credit losses (PCL), LHFI	8,322	12,919	19,777	14,775
Balance at end of period	134,031	115,050	134,031	115,050
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	23,170	14,103	23,140	18,939
Loans charged-off	(635)	(191)	(1,562)	(566)
Recoveries	267	111	754	414
Provision for credit losses (PCL), LHFI	953	10,081	1,423	5,317
Balance at end of period	23,755	24,104	23,755	24,104
Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI			5,400
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,540	5,139	5,792	4,774
Loans charged-off	(2,421)	(458)	(6,565)	(1,394)
Recoveries	1,337	425	3,875	1,256
Provision for credit losses (PCL), LHFI	1,348	(78)	2,702	392
Balance at end of period	5,804	5,028	5,804	5,028
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	676	1,917	885	2,708
Loans charged-off	0		0
Recoveries	0		0
Provision for credit losses (PCL), LHFI	(11)	(323)	(220)	(1,114)
Balance at end of period	665	1,594	665	1,594
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,607	4,963	4,647	5,348
Loans charged-off	(9)	(1,859)	(32)	(4,761)
Recoveries	0	933	0	2,941
Provision for credit losses (PCL), LHFI	5,092	661	6,075	1,170
Balance at end of period	10,690	4,698	10,690	4,698
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	15,343	7,301	12,828	6,079
Loans charged-off	(228)	(189)	(242)	(223)
Recoveries	22	43	94	1,230
Provision for credit losses (PCL), LHFI	2,104	3,096	4,561	3,165
Balance at end of period	17,241	10,251	17,241	10,251
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	12,173	10,038	12,374	10,310
Loans charged-off	(110)	(33)	(230)	(95)
Recoveries	43	234	165	529
Provision for credit losses (PCL), LHFI	457	500	254	(5)
Balance at end of period	12,563	10,739	12,563	10,739
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	20,376	29,735	19,488	37,912
Loans charged-off	(192)	0	(278)
Recoveries	2,216	35	2,322	1,536
Provision for credit losses (PCL), LHFI	898	(3,846)	1,766	(13,524)
Balance at end of period	23,298	25,924	23,298	25,924
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,481	3,297	4,743	4,713
Loans charged-off	0	0	0	(131)
Recoveries	0	4	5	11
Provision for credit losses (PCL), LHFI	84	97	(1,183)	(1,195)
Balance at end of period	3,565	3,398	3,565	3,398
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	28,555	12,250	21,185	2,706
Loans charged-off	(448)	(37)	(903)	(116)
Recoveries	7	125	27	135
Provision for credit losses (PCL), LHFI	2,030	3,057	9,835	12,670
Balance at end of period	30,144	15,395	30,144	15,395
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	14,377	14,397	15,132	5,968
Loans charged-off	(3,453)	(153)	(3,453)	(153)
Recoveries	15	1	63	205
Provision for credit losses (PCL), LHFI	(4,633)	(326)	(5,436)	7,899
Balance at end of period	$ 6,306	$ 13,919	$ 6,306	$ 13,919