Loans and Allowance for Credit Losses - Schedule of Amortized Cost and Unpaid Principal for Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 4,724,078	$ 4,867,572
Unpaid Principal	4,740,698	4,884,644
Difference	(16,620)	(17,072)
Allowance for credit losses	(41,553)	(42,213)
Loans, net	4,682,525	4,825,359
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	625,763	632,775
Unpaid Principal	627,657	634,319
Difference	(1,894)	(1,544)
Construction, land development, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	119,560	123,464
Unpaid Principal	119,628	123,643
Difference	(68)	(179)
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	117,534	123,115
Unpaid Principal	117,873	123,443
Difference	(339)	(328)
Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	17,910	77,394
Unpaid Principal	18,102	77,905
Difference	(192)	(511)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,375,044	1,430,429
Unpaid Principal	1,383,979	1,440,542
Difference	(8,935)	(10,113)
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,764,590	1,699,537
Unpaid Principal	1,769,774	1,703,936
Difference	(5,184)	(4,399)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	9,276	10,885
Unpaid Principal	9,284	10,883
Difference	(8)	2
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	694,401	769,973
Unpaid Principal	694,401	769,973
Difference	$ 0	$ 0