Loans and Allowance for Credit Losses - Summary of Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	$ 90,995	$ 54,613	$ 29,092	$ 31,895	$ 29,416	$ 27,571
Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	114,576
ACL Allocation	46,627
Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	23,061
Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	78,768
Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	7,182
Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	5,565
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	13,152	15,539	5,353	5,798	5,677	4,493
Commercial real estate | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	14,564
ACL Allocation	1,668
Commercial real estate | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	14,198
Commercial real estate | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Commercial real estate | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Commercial real estate | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	366
Construction, land development, land
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	5,600	5,917	1,382	1,084	1,035	1,134
Construction, land development, land | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	2,112
ACL Allocation	271
Construction, land development, land | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	2,112
Construction, land development, land | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Construction, land development, land | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Construction, land development, land | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
1-4 family residential
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	1,972	2,027	308	417	409	317
1-4 family residential | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	2,143
ACL Allocation	24
1-4 family residential | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	1,962
1-4 family residential | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
1-4 family residential | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
1-4 family residential | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	181
Farmland
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	863	958	670	939	590	535
Farmland | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	2,634
ACL Allocation	0
Farmland | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	1,914
Farmland | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Farmland | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	148
Farmland | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	572
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	22,713	23,283	12,566	14,771	13,899	12,865
Commercial | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	18,926
ACL Allocation	4,563
Commercial | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	2,875
Commercial | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	4,893
Commercial | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	7,034
Commercial | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	4,124
Factored receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	44,985	5,244	7,657	7,717	6,861	7,299
Factored receivables | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	73,875
ACL Allocation	40,072
Factored receivables | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Factored receivables | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	73,875
Factored receivables | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Factored receivables | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	710	768	488	581	563	615
Consumer | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	322
ACL Allocation	29
Consumer | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Consumer | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Consumer | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Consumer | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	322
Mortgage warehouse
Financing Receivable, Allowance for Credit Loss [Line Items]
ACL Allocation	1,000	$ 877	$ 668	$ 588	$ 382	$ 313
Mortgage warehouse | Collateral dependent loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
ACL Allocation	0
Mortgage warehouse | Collateral dependent loans | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Mortgage warehouse | Collateral dependent loans | Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Mortgage warehouse | Collateral dependent loans | Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	0
Mortgage warehouse | Collateral dependent loans | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	$ 0