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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 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | $ 39,313 | $ 40,528 |  |
Loan Evaluation, Collectively | 2,755,945 | 1,960,189 |  |
Loans | 2,810,856 | 2,027,624 |  |
ALLL Allocations, Individually | 2,713 | 3,773 |  |
ALLL Allocations, Collectively | 16,035 | 11,277 |  |
ALLL Allocations, Total ALLL | 18,748 | 15,405 | $ 12,567 | $ 8,843
Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 15,598 | 26,907 |  |
ALLL Allocations, PCI |  | 355 |  |
Commercial real estate |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 1,013 | 1,456 |  |
Loan Evaluation, Collectively | 735,118 | 427,918 |  |
Loans | 745,893 | 442,237 |  |
ALLL Allocations, Individually | 123 | 100 |  |
ALLL Allocations, Collectively | 3,312 | 1,358 |  |
ALLL Allocations, Total ALLL | 3,435 | 1,813 | 1,489 | 533
Commercial real estate | Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 9,762 | 12,863 |  |
ALLL Allocations, PCI |  | 355 |  |
Construction, land development, land |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 136 | 362 |  |
Loan Evaluation, Collectively | 130,732 | 105,493 |  |
Loans | 134,812 | 109,812 |  |
ALLL Allocations, Individually |  | 25 |  |
ALLL Allocations, Collectively | 883 | 440 |  |
ALLL Allocations, Total ALLL | 883 | 465 | 367 | 333
Construction, land development, land | Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 3,944 | 3,957 |  |
1-4 family residential properties |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 2,638 | 1,095 |  |
Loan Evaluation, Collectively | 122,093 | 101,551 |  |
Loans | 125,827 | 104,974 |  |
ALLL Allocations, Individually | 152 | 1 |  |
ALLL Allocations, Collectively | 141 | 252 |  |
ALLL Allocations, Total ALLL | 293 | 253 | 274 | 215
1-4 family residential properties | Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 1,096 | 2,328 |  |
Farmland |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 3,800 | 1,333 |  |
Loan Evaluation, Collectively | 176,232 | 140,045 |  |
Loans | 180,141 | 141,615 |  |
ALLL Allocations, Collectively | 310 | 170 |  |
ALLL Allocations, Total ALLL | 310 | 170 | 134 | 19
Farmland | Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 109 | 237 |  |
Commercial Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 26,616 | 33,033 |  |
Loan Evaluation, Collectively | 893,509 | 738,088 |  |
Loans | 920,812 | 778,643 |  |
ALLL Allocations, Individually | 1,409 | 2,101 |  |
ALLL Allocations, Collectively | 6,741 | 5,913 |  |
ALLL Allocations, Total ALLL | 8,150 | 8,014 | 5,276 | 4,003
Commercial Loans | Purchased Credit Impaired Loans |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loans | 687 | 7,522 |  |
Factored receivables |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 4,726 | 3,176 |  |
Loan Evaluation, Collectively | 369,684 | 235,022 |  |
Loans | 374,410 | 238,198 |  |
ALLL Allocations, Individually | 949 | 1,546 |  |
ALLL Allocations, Collectively | 3,648 | 2,542 |  |
ALLL Allocations, Total ALLL | 4,597 | 4,088 | 4,509 | 3,462
Consumer |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Individually | 384 | 73 |  |
Loan Evaluation, Collectively | 30,747 | 29,691 |  |
Loans | 31,131 | 29,764 |  |
ALLL Allocations, Individually | 80 |  |  |
ALLL Allocations, Collectively | 703 | 420 |  |
ALLL Allocations, Total ALLL | 783 | 420 | 216 | 140
Mortgage warehouse |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Loan Evaluation, Collectively | 297,830 | 182,381 |  |
Loans | 297,830 | 182,381 |  |
ALLL Allocations, Collectively | 297 | 182 |  |
ALLL Allocations, Total ALLL | $ 297 | $ 182 | $ 302 | $ 138

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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