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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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	$ 41,212	$ 39,313
Loan Evaluation, Collectively	3,547,364	2,755,945
Loans	3,608,644	2,810,856
ALLL Allocations, Individually	4,653	2,713
ALLL Allocations, Collectively	22,914	16,035
ALLL Allocations, Total ALLL	27,571	18,748	$ 15,405	$ 12,567
Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	20,068	15,598
ALLL Allocations, PCI	4
Commercial real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	7,097	1,013
Loan Evaluation, Collectively	974,280	735,118
Loans	992,080	745,893
ALLL Allocations, Individually	487	123
ALLL Allocations, Collectively	4,006	3,312
ALLL Allocations, Total ALLL	4,493	3,435	1,813	1,489
Commercial real estate | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	10,703	9,762
Construction, land development, land
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	91	136
Loan Evaluation, Collectively	172,709	130,732
Loans	179,591	134,812
ALLL Allocations, Individually	21
ALLL Allocations, Collectively	1,113	883
ALLL Allocations, Total ALLL	1,134	883	465	367
Construction, land development, land | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	6,791	3,944
1-4 family residential properties
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	2,333	2,638
Loan Evaluation, Collectively	186,664	122,093
Loans	190,185	125,827
ALLL Allocations, Individually	125	152
ALLL Allocations, Collectively	192	141
ALLL Allocations, Total ALLL	317	293	253	274
1-4 family residential properties | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	1,188	1,096
Farmland
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	7,424	3,800
Loan Evaluation, Collectively	162,735	176,232
Loans	170,540	180,141
ALLL Allocations, Individually	72
ALLL Allocations, Collectively	463	310
ALLL Allocations, Total ALLL	535	310	170	134
Farmland | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	381	109
Commercial Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	17,153	26,616
Loan Evaluation, Collectively	1,096,813	893,509
Loans	1,114,971	920,812
ALLL Allocations, Individually	1,958	1,409
ALLL Allocations, Collectively	10,903	6,741
ALLL Allocations, Total ALLL	12,865	8,150	8,014	5,276
Commercial Loans | Purchased Credit Impaired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans	1,005	687
ALLL Allocations, PCI	4
Factored receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	6,759	4,726
Loan Evaluation, Collectively	611,032	369,684
Loans	617,791	374,410
ALLL Allocations, Individually	1,968	949
ALLL Allocations, Collectively	5,331	3,648
ALLL Allocations, Total ALLL	7,299	4,597	4,088	4,509
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Individually	355	384
Loan Evaluation, Collectively	29,467	30,747
Loans	29,822	31,131
ALLL Allocations, Individually	22	80
ALLL Allocations, Collectively	593	703
ALLL Allocations, Total ALLL	615	783	420	216
Mortgage warehouse
Financing Receivable Allowance For Credit Losses [Line Items]
Loan Evaluation, Collectively	313,664	297,830
Loans	313,664	297,830
ALLL Allocations, Collectively	313	297
ALLL Allocations, Total ALLL	$ 313	$ 297	$ 182	$ 302

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A valuation allowance for financing receivables that are expected to be uncollectible.

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