LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 9,498		$ 13,661
Individually Evaluated for Credit Loss	33,978		37,140
Collectively Evaluated for Credit Loss	155,744		146,609
Collectively Evaluated for Credit Loss	13,514,178		13,052,802
Total LHFI	13,548,156		13,089,942
Total	165,242	$ 168,237	160,270	$ 157,929	$ 154,685	$ 139,367
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	8,414		10,518
Individually Evaluated for Credit Loss	14,337		22,503
Collectively Evaluated for Credit Loss	16,685		16,502
Collectively Evaluated for Credit Loss	1,889,269		1,818,219
Total LHFI	1,903,606		1,840,722
Total	25,099	28,465	27,020	32,545	28,735	26,638
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	114
Individually Evaluated for Credit Loss	114
Collectively Evaluated for Credit Loss	5,214		5,141
Collectively Evaluated for Credit Loss	158,348		156,569
Total LHFI	158,462		156,569
Total	5,328	5,111	5,141	5,699	5,645	5,794
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	859		1,250
Collectively Evaluated for Credit Loss	1,028,396		969,836
Total LHFI	1,028,396		969,836
Total	859	1,547	1,250	1,166	625	646
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	764		892
Individually Evaluated for Credit Loss	764		896
Collectively Evaluated for Credit Loss	7,596		5,355
Collectively Evaluated for Credit Loss	804,701		588,116
Total LHFI	805,465		589,012
Total	8,360	7,451	6,247	6,728	6,489	7,072
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	0		0
Individually Evaluated for Credit Loss	160		0
Collectively Evaluated for Credit Loss	7,127		6,452
Collectively Evaluated for Credit Loss	563,341		587,244
Total LHFI	563,501		587,244
Total	7,127	7,349	6,452	6,121	5,101	17,192
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	461		521
Collectively Evaluated for Credit Loss	13,143		11,347
Collectively Evaluated for Credit Loss	696,716		650,029
Total LHFI	697,177		650,550
Total	13,143	12,665	11,347	10,729	10,373	12,942
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	206		2,251
Individually Evaluated for Credit Loss	1,489		9,783
Collectively Evaluated for Credit Loss	33,932		35,645
Collectively Evaluated for Credit Loss	3,298,330		3,523,499
Total LHFI	3,299,819		3,533,282
Total	34,138	35,017	37,896	36,287	41,136	24,043
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	15,234		1,904
Collectively Evaluated for Credit Loss	23,909		19,491
Collectively Evaluated for Credit Loss	2,040,478		1,631,926
Total LHFI	2,055,712		1,633,830
Total	23,909	23,505	19,491	13,071	12,037	4,488
Other Loans Secured by Real Estate [Member] | Other Construction [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	4,981		13,297
Collectively Evaluated for Credit Loss	678,326		829,904
Total LHFI	678,326		829,904
Total	4,981	8,142	13,297	13,841	13,897	5,758
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	1,419		1,533
Collectively Evaluated for Credit Loss	42,298		32,129
Collectively Evaluated for Credit Loss	2,356,273		2,297,460
Total LHFI	2,357,692		2,298,993
Total	$ 42,298	$ 38,985	$ 32,129	$ 31,742	$ 30,647	$ 34,794