Loans and Allowance for Credit Losses - Schedule of Amortized Cost and Unpaid Principal for Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 4,433,304	$ 4,867,572
Unpaid Principal	4,452,404	4,884,644
Difference	(19,100)	(17,072)
Allowance for credit losses	(44,111)	(42,213)
Loans, net	4,389,193	4,825,359
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	669,742	632,775
Unpaid Principal	670,980	634,319
Difference	(1,238)	(1,544)
Construction, land development, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	75,527	123,464
Unpaid Principal	75,606	123,643
Difference	(79)	(179)
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	122,594	123,115
Unpaid Principal	122,804	123,443
Difference	(210)	(328)
Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	66,595	77,394
Unpaid Principal	66,838	77,905
Difference	(243)	(511)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,282,199	1,430,429
Unpaid Principal	1,295,015	1,440,542
Difference	(12,816)	(10,113)
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,449,080	1,699,537
Unpaid Principal	1,453,591	1,703,936
Difference	(4,511)	(4,399)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	9,506	10,885
Unpaid Principal	9,509	10,883
Difference	(3)	2
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	758,061	769,973
Unpaid Principal	758,061	769,973
Difference	$ 0	$ 0