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Loans and Allowance for Loan and Lease Losses - Summary of Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				$ 18,748				$ 15,405	$ 18,748	$ 15,405	$ 12,567
Provision for loan losses	$ 1,910	$ 6,803	$ 4,906	2,548	$ 1,931	$ 572	$ 1,447	7,678	16,167	11,628	6,693
Charge-offs									(8,434)	(8,418)	(5,152)
Recoveries									1,090	2,236	1,297
Reclassification To Held for Sale										(2,103)
Ending Balance	27,571				18,748				27,571	18,748	15,405
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				3,435				1,813	3,435	1,813	1,489
Provision for loan losses									1,044	1,822	313
Charge-offs									(90)	(259)	(5)
Recoveries									104	59	16
Ending Balance	4,493				3,435				4,493	3,435	1,813
Construction, land development, land
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				883				465	883	465	367
Provision for loan losses									293	825	92
Charge-offs									(59)	(582)
Recoveries									17	175	6
Ending Balance	1,134				883				1,134	883	465
1-4 family residential properties
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				293				253	293	253	274
Provision for loan losses									23	24	(22)
Charge-offs									(17)	(31)	(84)
Recoveries									18	47	85
Ending Balance	317				293				317	293	253
Farmland
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				310				170	310	170	134
Provision for loan losses									425	140	36
Charge-offs									(200)
Ending Balance	535				310				535	310	170
Commercial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				8,150				8,014	8,150	8,014	5,276
Provision for loan losses									10,052	5,785	5,390
Charge-offs									(5,855)	(4,875)	(3,643)
Recoveries									518	1,329	991
Reclassification To Held for Sale										(2,103)
Ending Balance	12,865				8,150				12,865	8,150	8,014
Factored receivables
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				4,597				4,088	4,597	4,088	4,509
Provision for loan losses									3,857	2,058	315
Charge-offs									(1,224)	(1,667)	(856)
Recoveries									69	118	120
Ending Balance	7,299				4,597				7,299	4,597	4,088
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				783				420	783	420	216
Provision for loan losses									457	859	689
Charge-offs									(989)	(1,004)	(564)
Recoveries									364	508	79
Ending Balance	615				783				615	783	420
Mortgage warehouse
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				$ 297				$ 182	297	182	302
Provision for loan losses									16	115	(120)
Ending Balance	$ 313				$ 297				$ 313	$ 297	$ 182

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Amount of allowance for loan and lease losses reclassified to assets held for sale.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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