LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 12,620	$ 12,403
Individually Evaluated for Credit Loss	42,940	49,082
Collectively Evaluated for Credit Loss	130,378	126,964
Collectively Evaluated for Credit Loss	13,015,003	12,901,442
Total LHFI	13,057,943	12,950,524
Total	142,998	139,367	$ 122,239	$ 120,214
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	10,960	11,436
Individually Evaluated for Credit Loss	21,210	21,102
Collectively Evaluated for Credit Loss	16,970	15,202
Collectively Evaluated for Credit Loss	1,901,501	1,901,808
Total LHFI	1,922,711	1,922,910
Total	27,930	26,638	23,462	23,140
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,523	5,794
Collectively Evaluated for Credit Loss	159,340	165,734
Total LHFI	159,340	165,734
Total	5,523	5,794	5,532	5,792
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	638	646
Collectively Evaluated for Credit Loss	1,052,844	1,088,466
Total LHFI	1,052,844	1,088,466
Total	638	646	729	885
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	1,022	967
Individually Evaluated for Credit Loss	1,022	967
Collectively Evaluated for Credit Loss	5,034	6,105
Collectively Evaluated for Credit Loss	563,239	555,068
Total LHFI	564,261	556,035
Total	6,056	7,072	5,710	4,647
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	12	0
Individually Evaluated for Credit Loss	1,539	2,020
Collectively Evaluated for Credit Loss	5,731	17,192
Collectively Evaluated for Credit Loss	615,469	640,866
Total LHFI	617,008	642,886
Total	5,743	17,192	13,260	12,828
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	923	946
Collectively Evaluated for Credit Loss	10,554	12,942
Collectively Evaluated for Credit Loss	624,464	621,451
Total LHFI	625,387	622,397
Total	10,554	12,942	11,918	12,374
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	917	20,812
Collectively Evaluated for Credit Loss	33,292	24,043
Collectively Evaluated for Credit Loss	3,542,318	3,468,622
Total LHFI	3,543,235	3,489,434
Total	33,292	24,043	18,640	19,488
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	9,251	4,488
Collectively Evaluated for Credit Loss	1,384,610	1,312,551
Total LHFI	1,384,610	1,312,551
Total	9,251	4,488	2,362	4,743
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	626	0
Individually Evaluated for Credit Loss	13,038	0
Collectively Evaluated for Credit Loss	11,439	5,758
Collectively Evaluated for Credit Loss	909,415	867,793
Total LHFI	922,453	867,793
Total	12,065	5,758	14,470	15,132
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	4,291	3,235
Collectively Evaluated for Credit Loss	31,946	34,794
Collectively Evaluated for Credit Loss	2,261,803	2,279,083
Total LHFI	2,266,094	2,282,318
Total	$ 31,946	$ 34,794	$ 26,156	$ 21,185