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Loans and Allowance for Credit Losses - Summary of Amortized Cost of Loans Currently in Deferral (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 4,867,572	$ 4,996,776
Balance of Loans Currently in Deferral	$ 31,896	$ 104,597
Percentage of Portfolio	0.70%	2.10%
Accrued Interest Receivable	$ 124	$ 726
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	632,775	779,158
Balance of Loans Currently in Deferral	$ 30,212	$ 69,980
Percentage of Portfolio	4.80%	9.00%
Accrued Interest Receivable	$ 116	$ 357
Construction, land development, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	123,464	219,647
Balance of Loans Currently in Deferral	$ 1,340	$ 18,821
Percentage of Portfolio	1.10%	8.60%
Accrued Interest Receivable	$ 5	$ 183
1-4 family residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	123,115	157,147
Balance of Loans Currently in Deferral	$ 0	$ 1,129
Percentage of Portfolio	0.00%	0.70%
Accrued Interest Receivable	$ 0	$ 15
Farmland
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	77,394	103,685
Balance of Loans Currently in Deferral	$ 338	$ 0
Percentage of Portfolio	0.40%	0.00%
Accrued Interest Receivable	$ 3	$ 0
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,430,429	1,562,957
Balance of Loans Currently in Deferral	$ 0	$ 14,561
Percentage of Portfolio	0.00%	0.90%
Accrued Interest Receivable	$ 0	$ 166
Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,699,537	1,120,770
Balance of Loans Currently in Deferral	$ 0	$ 0
Percentage of Portfolio	0.00%	0.00%
Accrued Interest Receivable	$ 0	$ 0
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	10,885	15,838
Balance of Loans Currently in Deferral	$ 6	$ 106
Percentage of Portfolio	0.10%	0.70%
Accrued Interest Receivable	$ 0	$ 5
Mortgage warehouse
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	769,973	1,037,574
Balance of Loans Currently in Deferral	$ 0	$ 0
Percentage of Portfolio	0.00%	0.00%
Accrued Interest Receivable	$ 0	$ 0

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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