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Loans and Allowance for Loan and Lease Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	$ 41,241		$ 39,313
Loan Evaluation, Collectively	3,450,624		2,755,945
Loans	3,512,143		2,810,856
ALLL Allocations, Individually	4,293		2,713
ALLL Allocations, Collectively	22,959		16,035
ALLL Allocations, Total ALLL	27,256	$ 24,547	18,748	$ 20,367	$ 19,797	$ 15,405
Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	20,278		15,598
ALLL Allocations, PCI	4
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	7,847		1,013
Loan Evaluation, Collectively	887,834		735,118
Loans	906,494		745,893
ALLL Allocations, Individually	581		123
ALLL Allocations, Collectively	3,461		3,312
ALLL Allocations, Total ALLL	4,042	3,803	3,435	2,564	2,506	1,813
Commercial real estate | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	10,813		9,762
Construction, land development, land
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	221		136
Loan Evaluation, Collectively	183,862		130,732
Loans	190,920		134,812
ALLL Allocations, Individually	74
ALLL Allocations, Collectively	1,197		883
ALLL Allocations, Total ALLL	1,271	1,025	883	1,125	915	465
Construction, land development, land | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	6,837		3,944
1-4 family residential properties
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	2,240		2,638
Loan Evaluation, Collectively	191,868		122,093
Loans	194,752		125,827
ALLL Allocations, Individually	125		152
ALLL Allocations, Collectively	134		141
ALLL Allocations, Total ALLL	259	240	293	282	149	253
1-4 family residential properties | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	644		1,096
Farmland
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	4,156		3,800
Loan Evaluation, Collectively	172,782		176,232
Loans	177,313		180,141
ALLL Allocations, Individually	72
ALLL Allocations, Collectively	431		310
ALLL Allocations, Total ALLL	503	509	310	239	261	170
Farmland | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	375		109
Commercial Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	19,680		26,616
Loan Evaluation, Collectively	1,102,309		893,509
Loans	1,123,598		920,812
ALLL Allocations, Individually	1,496		1,409
ALLL Allocations, Collectively	11,253		6,741
ALLL Allocations, Total ALLL	12,753	10,230	8,150	10,148	10,603	8,014
Commercial Loans | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	1,609		687
ALLL Allocations, PCI	4
Factored receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	6,841		4,726
Loan Evaluation, Collectively	604,444		369,684
Loans	611,285		374,410
ALLL Allocations, Individually	1,916		949
ALLL Allocations, Collectively	5,655		3,648
ALLL Allocations, Total ALLL	7,571	7,727	4,597	5,046	4,507	4,088
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	256		384
Loan Evaluation, Collectively	31,167		30,747
Loans	31,423		31,131
ALLL Allocations, Individually	29		80
ALLL Allocations, Collectively	552		703
ALLL Allocations, Total ALLL	581	670	783	743	627	420
Mortgage warehouse
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Collectively	276,358		297,830
Loans	276,358		297,830
ALLL Allocations, Collectively	276		297
ALLL Allocations, Total ALLL	$ 276	$ 343	$ 297	$ 220	$ 229	$ 182

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