LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 139,367	$ 120,214
Loans charged-off	(6,324)	(2,996)
Recoveries	2,247	1,777
Net (charge-offs) recoveries	(4,077)	(1,219)
Provision for credit losses (PCL), LHFI	7,708	3,244
Balance at end of period	142,998	122,239
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	26,638	23,140
Loans charged-off	(584)	(471)
Recoveries	198	270
Provision for credit losses (PCL), LHFI	1,678	523
Balance at end of period	27,930	23,462
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,794	5,792
Loans charged-off	(2,748)	(2,155)
Recoveries	1,505	1,317
Provision for credit losses (PCL), LHFI	972	578
Balance at end of period	5,523	5,532
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	646	885
Loans charged-off	0
Recoveries	0
Provision for credit losses (PCL), LHFI	(8)	(156)
Balance at end of period	638	729
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	7,072	4,647
Loans charged-off	(53)	0
Recoveries	29	0
Provision for credit losses (PCL), LHFI	(992)	1,063
Balance at end of period	6,056	5,710
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	17,192	12,828
Loans charged-off	(24)	(14)
Recoveries	1	8
Provision for credit losses (PCL), LHFI	(11,426)	438
Balance at end of period	5,743	13,260
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	12,942	12,374
Loans charged-off	(76)	(34)
Recoveries	450	47
Provision for credit losses (PCL), LHFI	(2,762)	(469)
Balance at end of period	10,554	11,918
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	24,043	19,488
Loans charged-off	(2,428)	(28)
Recoveries	9	96
Provision for credit losses (PCL), LHFI	11,668	(916)
Balance at end of period	33,292	18,640
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,488	4,743
Loans charged-off	0	0
Recoveries	0	3
Provision for credit losses (PCL), LHFI	4,763	(2,384)
Balance at end of period	9,251	2,362
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	34,794	21,185
Loans charged-off	(411)	(294)
Recoveries	38	6
Provision for credit losses (PCL), LHFI	(2,475)	5,259
Balance at end of period	31,946	26,156
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,758	15,132
Loans charged-off	0	0
Recoveries	17	30
Provision for credit losses (PCL), LHFI	6,290	(692)
Balance at end of period	$ 12,065	$ 14,470