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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 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | $ 32,477 |  | $ 40,528 |  |  |
Loan Evaluation, Collectively | 2,246,380 |  | 1,960,189 |  |  |
Loans | 2,295,100 |  | 2,027,624 |  |  |
ALLL Allocations, Individually | 4,063 |  | 3,773 |  |  |
ALLL Allocations, Collectively | 15,449 |  | 11,277 |  |  |
ALLL Allocations, Total ALLL | 19,797 | $ 19,093 | 15,405 | $ 13,772 | $ 12,093 | $ 12,567
Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 16,243 |  | 26,907 |  |  |
ALLL Allocations, PCI | 285 |  | 355 |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 862 |  | 1,456 |  |  |
Loan Evaluation, Collectively | 529,803 |  | 427,918 |  |  |
Loans | 541,217 |  | 442,237 |  |  |
ALLL Allocations, Individually | 126 |  | 100 |  |  |
ALLL Allocations, Collectively | 2,380 |  | 1,358 |  |  |
ALLL Allocations, Total ALLL | 2,506 | 2,243 | 1,813 | 1,792 | 1,619 | 1,489
Commercial real estate | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 10,552 |  | 12,863 |  |  |
ALLL Allocations, PCI |  |  | 355 |  |  |
Construction, land development, land |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 134 |  | 362 |  |  |
Loan Evaluation, Collectively | 117,220 |  | 105,493 |  |  |
Loans | 120,253 |  | 109,812 |  |  |
ALLL Allocations, Individually |  |  | 25 |  |  |
ALLL Allocations, Collectively | 915 |  | 440 |  |  |
ALLL Allocations, Total ALLL | 915 | 566 | 465 | 181 | 198 | 367
Construction, land development, land | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 2,899 |  | 3,957 |  |  |
1-4 family residential properties |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 1,710 |  | 1,095 |  |  |
Loan Evaluation, Collectively | 98,734 |  | 101,551 |  |  |
Loans | 101,833 |  | 104,974 |  |  |
ALLL Allocations, Individually |  |  | 1 |  |  |
ALLL Allocations, Collectively | 149 |  | 252 |  |  |
ALLL Allocations, Total ALLL | 149 | 160 | 253 | 259 | 285 | 274
1-4 family residential properties | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 1,389 |  | 2,328 |  |  |
Farmland |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 3,480 |  | 1,333 |  |  |
Loan Evaluation, Collectively | 132,537 |  | 140,045 |  |  |
Loans | 136,258 |  | 141,615 |  |  |
ALLL Allocations, Collectively | 261 |  | 170 |  |  |
ALLL Allocations, Total ALLL | 261 | 214 | 170 | 143 | 133 | 134
Farmland | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 241 |  | 237 |  |  |
Commercial Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 22,886 |  | 33,033 |  |  |
Loan Evaluation, Collectively | 818,667 |  | 738,088 |  |  |
Loans | 842,715 |  | 778,643 |  |  |
ALLL Allocations, Individually | 2,387 |  | 2,101 |  |  |
ALLL Allocations, Collectively | 7,931 |  | 5,913 |  |  |
ALLL Allocations, Total ALLL | 10,603 | 11,177 | 8,014 | 6,697 | 5,331 | 5,276
Commercial Loans | Purchased Credit Impaired Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans | 1,162 |  | 7,522 |  |  |
ALLL Allocations, PCI | 285 |  |  |  |  |
Factored receivables |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 3,295 |  | 3,176 |  |  |
Loan Evaluation, Collectively | 290,338 |  | 235,022 |  |  |
Loans | 293,633 |  | 238,198 |  |  |
ALLL Allocations, Individually | 1,550 |  | 1,546 |  |  |
ALLL Allocations, Collectively | 2,957 |  | 2,542 |  |  |
ALLL Allocations, Total ALLL | 4,507 | 4,064 | 4,088 | 4,204 | 4,110 | 4,509
Consumer |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Individually | 110 |  | 73 |  |  |
Loan Evaluation, Collectively | 29,387 |  | 29,691 |  |  |
Loans | 29,497 |  | 29,764 |  |  |
ALLL Allocations, Collectively | 627 |  | 420 |  |  |
ALLL Allocations, Total ALLL | 627 | 547 | 420 | 293 | 222 | 216
Mortgage warehouse |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan Evaluation, Collectively | 229,694 |  | 182,381 |  |  |
Loans | 229,694 |  | 182,381 |  |  |
ALLL Allocations, Collectively | 229 |  | 182 |  |  |
ALLL Allocations, Total ALLL | $ 229 | $ 122 | $ 182 | $ 203 | $ 195 | $ 302

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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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