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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, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | $ 31,674 | $ 31,525
Past Due 90 Days or More Still Accruing | 1,664 | 3,621
Nonaccrual | 32,149 | 38,030
Total Past Due | 65,487 | 73,176
Purchased Credit Impaired Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 72 | 2,020
Past Due 90 Days or More Still Accruing |  | 104
Nonaccrual | 2,333 | 8,233
Total Past Due | 2,405 | 10,357
Commercial real estate |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 1,374 | 699
Past Due 90 Days or More Still Accruing |  | 144
Nonaccrual | 1,012 | 1,163
Total Past Due | 2,386 | 2,006
Construction, land development, land |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due |  | 619
Nonaccrual | 136 | 362
Total Past Due | 136 | 981
1-4 family residential properties |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 1,378 | 956
Past Due 90 Days or More Still Accruing | 62 |
Nonaccrual | 2,625 | 1,039
Total Past Due | 4,065 | 1,995
Farmland |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 250 | 3,583
Past Due 90 Days or More Still Accruing | 109 | 141
Nonaccrual | 3,412 | 541
Total Past Due | 3,771 | 4,265
Commercial Loans |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 6,630 | 11,060
Past Due 90 Days or More Still Accruing | 39 | 1,077
Nonaccrual | 22,247 | 26,619
Total Past Due | 28,916 | 38,756
Factored receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 20,858 | 11,921
Past Due 90 Days or More Still Accruing | 1,454 | 2,153
Total Past Due | 22,312 | 14,074
Consumer |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 947 | 667
Past Due 90 Days or More Still Accruing |  | 2
Nonaccrual | 384 | 73
Total Past Due | 1,331 | $ 742
Mortgage warehouse |  |
Accounts Notes And Loans Receivable [Line Items] |  |
30-89 Days Past Due | 165 |
Total Past Due | $ 165 |

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