LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 120,214	$ 99,457
Loans charged-off	(2,996)	(2,242)
Recoveries	1,777	2,379
Net (charge-offs) recoveries	(1,219)	137
Provision for credit losses (PCL), LHFI	3,244	(860)
Balance at end of period	122,239	98,734
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI		2,900
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	23,140	18,939
Loans charged-off	(471)	(285)
Recoveries	270	100
Provision for credit losses (PCL), LHFI	(523)	3,803
Balance at end of period	23,462	14,951
Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI		8,000
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,792	4,774
Loans charged-off	(2,155)	(579)
Recoveries	1,317	379
Provision for credit losses (PCL), LHFI	(578)	(298)
Balance at end of period	5,532	4,872
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	885	2,708
Loans charged-off	0
Recoveries	0
Provision for credit losses (PCL), LHFI	(156)	(337)
Balance at end of period	729	2,371
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,647	5,348
Loans charged-off	0	(1,337)
Recoveries	0	929
Provision for credit losses (PCL), LHFI	1,063	(863)
Balance at end of period	5,710	4,077
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	12,828	6,079
Loans charged-off	(14)	(28)
Recoveries	8	843
Provision for credit losses (PCL), LHFI	438	(457)
Balance at end of period	13,260	7,351
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	12,374	10,310
Loans charged-off	(34)	(13)
Recoveries	47	89
Provision for credit losses (PCL), LHFI	469	(519)
Balance at end of period	11,918	9,867
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	19,488	37,912
Loans charged-off	(28)	0
Recoveries	96	27
Provision for credit losses (PCL), LHFI	(916)	(5,909)
Balance at end of period	18,640	32,030
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,743	4,713
Loans charged-off	0
Recoveries	3	3
Provision for credit losses (PCL), LHFI	(2,384)	(1,076)
Balance at end of period	2,362	3,640
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	21,185	2,706
Loans charged-off	(294)	0
Recoveries	6	6
Provision for credit losses (PCL), LHFI	5,259	(2,916)
Balance at end of period	26,156	5,628
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	15,132	5,968
Loans charged-off	0
Recoveries	30	3
Provision for credit losses (PCL), LHFI	(692)	(7,976)
Balance at end of period	$ 14,470	$ 13,947