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Loans and Allowance for Loan and Lease Losses - Summary of Analysis Performed Risk category Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 3,608,644	$ 2,810,856
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	992,080	745,893
Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	179,591	134,812
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	190,185	125,827
Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	170,540	180,141
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,114,971	920,812
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	617,791	374,410
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	29,822	31,131
Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	313,664	297,830
Purchased Credit Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	20,068	15,598
Purchased Credit Impaired Loans | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	10,703	9,762
Purchased Credit Impaired Loans | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	6,791	3,944
Purchased Credit Impaired Loans | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	1,188	1,096
Purchased Credit Impaired Loans | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	381	109
Purchased Credit Impaired Loans | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,005	687
Pass
Accounts Notes And Loans Receivable [Line Items]
Loans	3,548,534	2,734,333
Pass | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	977,548	732,175
Pass | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	172,709	130,732
Pass | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	187,251	122,044
Pass | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	161,565	171,017
Pass | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,093,759	878,957
Pass | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	612,577	370,839
Pass | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	29,461	30,739
Pass | Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	313,664	297,830
Substandard
Accounts Notes And Loans Receivable [Line Items]
Loans	38,372	59,679
Substandard | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	3,829	3,956
Substandard | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	91	136
Substandard | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	1,746	2,687
Substandard | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	8,594	9,015
Substandard | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	20,207	41,168
Substandard | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	3,544	2,325
Substandard | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	361	392
Doubtful
Accounts Notes And Loans Receivable [Line Items]
Loans	1,670	1,246
Doubtful | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 1,670	$ 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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