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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, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 2,810,856	$ 2,027,624
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	745,893	442,237
Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	134,812	109,812
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	125,827	104,974
Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	180,141	141,615
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	920,812	778,643
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	374,410	238,198
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	31,131	29,764
Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	297,830	182,381
Purchased Credit Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	15,598	26,907
Purchased Credit Impaired Loans | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	9,762	12,863
Purchased Credit Impaired Loans | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	3,944	3,957
Purchased Credit Impaired Loans | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	1,096	2,328
Purchased Credit Impaired Loans | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	109	237
Purchased Credit Impaired Loans | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	687	7,522
Pass
Accounts Notes And Loans Receivable [Line Items]
Loans	2,734,333	1,943,516
Pass | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	732,175	422,423
Pass | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	130,732	105,493
Pass | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	122,044	101,339
Pass | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	171,017	136,474
Pass | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	878,957	729,634
Pass | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	370,839	236,084
Pass | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	30,739	29,688
Pass | Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	297,830	182,381
Substandard
Accounts Notes And Loans Receivable [Line Items]
Loans	59,679	56,116
Substandard | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	3,956	6,951
Substandard | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	136	362
Substandard | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	2,687	1,307
Substandard | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	9,015	4,904
Substandard | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	41,168	41,487
Substandard | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	2,325	1,029
Substandard | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	392	76
Doubtful
Accounts Notes And Loans Receivable [Line Items]
Loans	1,246	1,085
Doubtful | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 1,246	$ 1,085

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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://www.xbrl.org/2003/role/presentationRef
-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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