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Loans and Allowance for Loan and Lease Losses - Summary of Analysis Performed Risk category Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 3,196,462	$ 2,810,856
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	766,839	745,893
Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	147,852	134,812
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	122,653	125,827
Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	177,060	180,141
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	1,006,443	920,812
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	603,812	374,410
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	28,775	31,131
Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	343,028	297,830
Purchased Credit Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	15,024	15,598
Purchased Credit Impaired Loans | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	9,815	9,762
Purchased Credit Impaired Loans | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	3,880	3,944
Purchased Credit Impaired Loans | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	576	1,096
Purchased Credit Impaired Loans | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	107	109
Purchased Credit Impaired Loans | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	646	687
Pass
Accounts Notes And Loans Receivable [Line Items]
Loans	3,131,742	2,734,333
Pass | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	752,953	732,175
Pass | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	143,832	130,732
Pass | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	119,900	122,044
Pass | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	171,272	171,017
Pass | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	972,695	878,957
Pass | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	599,564	370,839
Pass | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	28,498	30,739
Pass | Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loans	343,028	297,830
Substandard
Accounts Notes And Loans Receivable [Line Items]
Loans	48,860	59,679
Substandard | Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loans	4,071	3,956
Substandard | Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loans	140	136
Substandard | 1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loans	2,177	2,687
Substandard | Farmland
Accounts Notes And Loans Receivable [Line Items]
Loans	5,681	9,015
Substandard | Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loans	33,102	41,168
Substandard | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	3,412	2,325
Substandard | Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans	277	392
Doubtful
Accounts Notes And Loans Receivable [Line Items]
Loans	836	1,246
Doubtful | Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 836	$ 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://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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