LHFI and ACL, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Modifications [Line Items]
Nonaccrual	$ 65,972	$ 62,698
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	1,902	5,878
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	19,775	12,775
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	3,957	3,418
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	6,957	12,508
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	231	150
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	25,102	19,328
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	181	117
State and Other Political Subdivision Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual		3,664
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	247	4,860
Troubled Debt Restructurings [Member]
Financing Receivable Modifications [Line Items]
Accruing	357	2,451	$ 1,506
Nonaccrual	9,804	19,160	24,254
Total	10,161	21,611	25,760
Troubled Debt Restructurings [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0	0	0
Nonaccrual	1,564	4,640	12
Total	1,564	4,640	12
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	66	50
Nonaccrual	3,289	2,484
Total	3,355	2,534
Troubled Debt Restructurings [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	193	0	0
Nonaccrual	823	965	3,699
Total	1,016	965	3,699
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	98	394	0
Nonaccrual	4,015	7,325	3,903
Total	4,113	7,719	3,903
Troubled Debt Restructurings [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0
Nonaccrual	68
Total	68
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0	2,000	1,500
Nonaccrual	45	215	12,749
Total	$ 45	2,215	14,249
Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing		7	6
Nonaccrual		9	17
Total		16	23
Troubled Debt Restructurings [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing		0	0
Nonaccrual		3,486	3,793
Total		3,486	3,793
Troubled Debt Restructurings [Member] | Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing		0
Nonaccrual		36	81
Total		$ 36	81
Troubled Debt Restructurings [Member] | Other Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing			$ 0