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Loans and Allowance for Loan and Lease Losses - Summary of Analysis Performed Risk category Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 3,512,143	$ 2,810,856
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	906,494	745,893
Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	190,920	134,812
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	194,752	125,827
Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	177,313	180,141
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,123,598	920,812
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	611,285	374,410
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	31,423	31,131
Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	276,358	297,830
Purchased Credit Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	20,278	15,598
Purchased Credit Impaired Loans | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	10,813	9,762
Purchased Credit Impaired Loans | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	6,837	3,944
Purchased Credit Impaired Loans | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	644	1,096
Purchased Credit Impaired Loans | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	375	109
Purchased Credit Impaired Loans | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,609	687
Pass
Accounts Notes And Loans Receivable [Line Items]
Loans	3,448,263	2,734,333
Pass | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	889,505	732,175
Pass | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	183,706	130,732
Pass | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	191,844	122,044
Pass | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	171,631	171,017
Pass | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,099,057	878,957
Pass | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	605,002	370,839
Pass | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	31,160	30,739
Pass | Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	276,358	297,830
Substandard
Accounts Notes And Loans Receivable [Line Items]
Loans	42,659	59,679
Substandard | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	6,176	3,956
Substandard | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	377	136
Substandard | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	2,264	2,687
Substandard | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	5,307	9,015
Substandard | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	22,932	41,168
Substandard | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	5,340	2,325
Substandard | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	263	392
Doubtful
Accounts Notes And Loans Receivable [Line Items]
Loans	943	1,246
Doubtful | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 943	$ 1,246

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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