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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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- 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://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 + Details
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