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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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- Definition 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 + Details
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