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Loans and Allowance for Loan and Lease Losses - Summary of Contractually Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | $ 52,695 | $ 31,674
Past Due 90 Days or More Still Accruing | 3,559 | 1,664
Nonaccrual | 30,785 | 32,149
Total Past Due | 87,039 | 65,487
Purchased Credit Impaired Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 788 | 72
Nonaccrual | 3,525 | 2,333
Total Past Due | 4,313 | 2,405
Commercial real estate |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 2,625 | 1,374
Past Due 90 Days or More Still Accruing | 397 |
Nonaccrual | 7,096 | 1,012
Total Past Due | 10,118 | 2,386
Construction, land development, land |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 1,003 |
Nonaccrual | 91 | 136
Total Past Due | 1,094 | 136
1-4 family residential properties |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 2,103 | 1,378
Past Due 90 Days or More Still Accruing |  | 62
Nonaccrual | 1,588 | 2,625
Total Past Due | 3,691 | 4,065
Farmland |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 308 | 250
Past Due 90 Days or More Still Accruing |  | 109
Nonaccrual | 4,059 | 3,412
Total Past Due | 4,367 | 3,771
Commercial Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 3,728 | 6,630
Past Due 90 Days or More Still Accruing | 999 | 39
Nonaccrual | 14,071 | 22,247
Total Past Due | 18,798 | 28,916
Factored receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 41,135 | 20,858
Past Due 90 Days or More Still Accruing | 2,152 | 1,454
Total Past Due | 43,287 | 22,312
Consumer |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 1,005 | 947
Past Due 90 Days or More Still Accruing | 11 |
Nonaccrual | 355 | 384
Total Past Due | $ 1,371 | 1,331
Mortgage warehouse |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due |  | 165
Total Past Due |  | $ 165

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