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Loans and Allowance for Loan and Lease Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | $ 41,241 |  | $ 39,313 |  |  |
Loan Evaluation, Collectively | 3,450,624 |  | 2,755,945 |  |  |
Loans | 3,512,143 |  | 2,810,856 |  |  |
ALLL Allocations, Individually | 4,293 |  | 2,713 |  |  |
ALLL Allocations, Collectively | 22,959 |  | 16,035 |  |  |
ALLL Allocations, Total ALLL | 27,256 | $ 24,547 | 18,748 | $ 20,367 | $ 19,797 | $ 15,405
Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 20,278 |  | 15,598 |  |  |
ALLL Allocations, PCI | 4 |  |  |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 7,847 |  | 1,013 |  |  |
Loan Evaluation, Collectively | 887,834 |  | 735,118 |  |  |
Loans | 906,494 |  | 745,893 |  |  |
ALLL Allocations, Individually | 581 |  | 123 |  |  |
ALLL Allocations, Collectively | 3,461 |  | 3,312 |  |  |
ALLL Allocations, Total ALLL | 4,042 | 3,803 | 3,435 | 2,564 | 2,506 | 1,813
Commercial real estate | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 10,813 |  | 9,762 |  |  |
Construction, land development, land |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 221 |  | 136 |  |  |
Loan Evaluation, Collectively | 183,862 |  | 130,732 |  |  |
Loans | 190,920 |  | 134,812 |  |  |
ALLL Allocations, Individually | 74 |  |  |  |  |
ALLL Allocations, Collectively | 1,197 |  | 883 |  |  |
ALLL Allocations, Total ALLL | 1,271 | 1,025 | 883 | 1,125 | 915 | 465
Construction, land development, land | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 6,837 |  | 3,944 |  |  |
1-4 family residential properties |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 2,240 |  | 2,638 |  |  |
Loan Evaluation, Collectively | 191,868 |  | 122,093 |  |  |
Loans | 194,752 |  | 125,827 |  |  |
ALLL Allocations, Individually | 125 |  | 152 |  |  |
ALLL Allocations, Collectively | 134 |  | 141 |  |  |
ALLL Allocations, Total ALLL | 259 | 240 | 293 | 282 | 149 | 253
1-4 family residential properties | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 644 |  | 1,096 |  |  |
Farmland |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 4,156 |  | 3,800 |  |  |
Loan Evaluation, Collectively | 172,782 |  | 176,232 |  |  |
Loans | 177,313 |  | 180,141 |  |  |
ALLL Allocations, Individually | 72 |  |  |  |  |
ALLL Allocations, Collectively | 431 |  | 310 |  |  |
ALLL Allocations, Total ALLL | 503 | 509 | 310 | 239 | 261 | 170
Farmland | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 375 |  | 109 |  |  |
Commercial Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 19,680 |  | 26,616 |  |  |
Loan Evaluation, Collectively | 1,102,309 |  | 893,509 |  |  |
Loans | 1,123,598 |  | 920,812 |  |  |
ALLL Allocations, Individually | 1,496 |  | 1,409 |  |  |
ALLL Allocations, Collectively | 11,253 |  | 6,741 |  |  |
ALLL Allocations, Total ALLL | 12,753 | 10,230 | 8,150 | 10,148 | 10,603 | 8,014
Commercial Loans | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 1,609 |  | 687 |  |  |
ALLL Allocations, PCI | 4 |  |  |  |  |
Factored receivables |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 6,841 |  | 4,726 |  |  |
Loan Evaluation, Collectively | 604,444 |  | 369,684 |  |  |
Loans | 611,285 |  | 374,410 |  |  |
ALLL Allocations, Individually | 1,916 |  | 949 |  |  |
ALLL Allocations, Collectively | 5,655 |  | 3,648 |  |  |
ALLL Allocations, Total ALLL | 7,571 | 7,727 | 4,597 | 5,046 | 4,507 | 4,088
Consumer |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 256 |  | 384 |  |  |
Loan Evaluation, Collectively | 31,167 |  | 30,747 |  |  |
Loans | 31,423 |  | 31,131 |  |  |
ALLL Allocations, Individually | 29 |  | 80 |  |  |
ALLL Allocations, Collectively | 552 |  | 703 |  |  |
ALLL Allocations, Total ALLL | 581 | 670 | 783 | 743 | 627 | 420
Mortgage warehouse |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Collectively | 276,358 |  | 297,830 |  |  |
Loans | 276,358 |  | 297,830 |  |  |
ALLL Allocations, Collectively | 276 |  | 297 |  |  |
ALLL Allocations, Total ALLL | $ 276 | $ 343 | $ 297 | $ 220 | $ 229 | $ 182

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