Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule of Amortized Cost Basis of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	$ 16,790	$ 22,769
Total Nonaccrual	64,399	62,698
Loans Past Due 90 Days or More Still Accruing	1,503	2,114
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	150	4,784
Total Nonaccrual	3,931	5,878
Loans Past Due 90 Days or More Still Accruing		7
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		1,319
Total Nonaccrual	3,238	3,418
Loans Past Due 90 Days or More Still Accruing	243	148
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	14,906	10,842
Total Nonaccrual	16,602	12,508
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		56
Total Nonaccrual	94	150
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	0
Total Nonaccrual	7,667
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	1,300
Total Nonaccrual	13,164	12,775
Loans Past Due 90 Days or More Still Accruing	1,091	1,655
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	434	1,363
Total Nonaccrual	15,922	19,328
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Nonaccrual	112	117
Loans Past Due 90 Days or More Still Accruing	169	304
State and Other Political Subdivision Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Nonaccrual	3,430	3,664
Other Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		4,405
Total Nonaccrual	$ 239	$ 4,860