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Loans and Allowance for Credit Losses - Summary of Contractually Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 4,867,572	$ 4,996,776
Factored receivables greater than 90 days past due	39,268	72,774
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	139,134	160,677
Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	73,519	39,928
Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,182	32,983
Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	46,433	87,766
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,728,438	4,836,099
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	632,775	779,158
Factored receivables greater than 90 days past due	0	0
Commercial real estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,037	9,282
Commercial real estate | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,021	1,512
Commercial real estate | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	147
Commercial real estate | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	16	7,623
Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	631,738	769,876
Construction, land development, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	123,464	219,647
Factored receivables greater than 90 days past due	0	22
Construction, land development, land | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	175	1,509
Construction, land development, land | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	30	185
Construction, land development, land | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	1,001
Construction, land development, land | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	145	323
Construction, land development, land | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	123,289	218,138
1-4 family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	123,115	157,147
Factored receivables greater than 90 days past due	134	0
1-4 family residential properties | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,176	3,378
1-4 family residential properties | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	730	1,978
1-4 family residential properties | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	332	448
1-4 family residential properties | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,114	952
1-4 family residential properties | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	120,939	153,769
Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	77,394	103,685
Factored receivables greater than 90 days past due	0	0
Farmland | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,509	1,707
Farmland | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	378	407
Farmland | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	154	1,000
Farmland | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	977	300
Farmland | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	75,885	101,978
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,430,429	1,562,957
Factored receivables greater than 90 days past due	0	35
Commercial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,290	9,619
Commercial | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	996	2,084
Commercial | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	346	1,765
Commercial | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,948	5,770
Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,424,139	1,553,338
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,699,537	1,120,770
Factored receivables greater than 90 days past due	39,134	72,717
Factored receivables | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	127,545	134,600
Factored receivables | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	70,109	33,377
Factored receivables | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,302	28,506
Factored receivables | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	39,134	72,717
Factored receivables | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,571,992	986,170
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,885	15,838
Factored receivables greater than 90 days past due	0	0
Consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	402	582
Consumer | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	255	385
Consumer | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	48	116
Consumer | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	99	81
Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,483	15,256
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	769,973	1,037,574
Factored receivables greater than 90 days past due	0	0
Mortgage warehouse | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Mortgage warehouse | Past Due 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Mortgage warehouse | Past Due 60-90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Mortgage warehouse | Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Mortgage warehouse | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 769,973	$ 1,037,574

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