LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 160,270	$ 139,367
Loans charged-off	(3,701)	(6,324)
Loans charged-off	(3,701)	(6,324)
Recoveries	2,316	2,247
Net (charge-offs) recoveries	(1,385)	(4,077)
PCL, LHFI	8,125	7,708
Balance at end of period	167,010	142,998
Loans Held for Investment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL, LHFI	8,125	7,708
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	27,020	26,638
Loans charged-off	(881)	(584)
Recoveries	235	198
PCL, LHFI	(978)	1,678
Balance at end of period	25,396	27,930
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,141	5,794
Loans charged-off	(2,204)	(2,748)
Recoveries	1,588	1,505
PCL, LHFI	713	972
Balance at end of period	5,238	5,523
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,250	646
Loans charged-off	0	0
Recoveries	0	0
PCL, LHFI	355	(8)
Balance at end of period	1,605	638
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,247	7,072
Loans charged-off	(68)	(53)
Recoveries	32	29
PCL, LHFI	319	(992)
Balance at end of period	6,530	6,056
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	6,452	17,192
Loans charged-off	0	(24)
Recoveries	2	1
PCL, LHFI	528	(11,426)
Balance at end of period	6,982	5,743
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	11,347	12,942
Loans charged-off	(168)	(76)
Recoveries	99	450
PCL, LHFI	1,198	(2,762)
Balance at end of period	12,476	10,554
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	37,896	24,043
Loans charged-off	0	(2,428)
Recoveries	0	9
PCL, LHFI	2,077	11,668
Balance at end of period	39,973	33,292
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	19,491	4,488
Loans charged-off	0	0
Recoveries	77	0
PCL, LHFI	3,780	4,763
Balance at end of period	23,348	9,251
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	32,129	34,794
Loans charged-off	(380)	(411)
Recoveries	281	38
PCL, LHFI	3,572	(2,475)
Balance at end of period	35,602	31,946
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,297	5,758
Loans charged-off	0	0
Recoveries	2	17
PCL, LHFI	(3,439)	6,290
Balance at end of period	$ 9,860	$ 12,065