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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Contractual Delinquency Information (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | $ 2,277,492 | $ 2,148,011 | $ 1,345,437
Commercial Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 891,693 | 796,344 | 533,695
Residential Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 577,218 | 610,738 | 484,335
Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 105,429 | 140,766 | 40,232
Commercial and Industrial |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 521,238 | 438,238 | 165,696
Installment and Other |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 4,228 | 2,959 | 1,926
Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 177,686 | 158,966 | $ 119,553
Acquired Non-Impaired and Originated Loans |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 30,950 | 20,882 |
Non-accrual | 15,764 | 6,784 |
Current | 1,918,852 | 1,723,092 |
Total loans and leases | 1,949,802 | 1,743,974 |
Acquired Non-Impaired and Originated Loans | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 12,613 | 12,686 |
Acquired Non-Impaired and Originated Loans | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,573 | 1,412 |
Acquired Non-Impaired and Originated Loans | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 14,210 | 7,527 |
Non-accrual | 8,459 | 3,935 |
Current | 710,771 | 581,514 |
Total loans and leases | 724,981 | 589,041 |
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 4,783 | 2,944 |
Acquired Non-Impaired and Originated Loans | Commercial Real Estate | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 968 | 648 |
Acquired Non-Impaired and Originated Loans | Residential Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,240 | 1,361 |
Non-accrual | 2,092 | 1,118 |
Current | 430,416 | 433,660 |
Total loans and leases | 432,656 | 435,021 |
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 148 | 243 |
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due |  | 1,363 |
Current | 99,483 | 132,424 |
Total loans and leases | 99,483 | 133,787 |
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due |  | 1,363 |
Acquired Non-Impaired and Originated Loans | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 11,982 | 7,398 |
Non-accrual | 4,348 | 958 |
Current | 499,248 | 417,376 |
Total loans and leases | 511,230 | 424,774 |
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 6,667 | 6,066 |
Acquired Non-Impaired and Originated Loans | Commercial and Industrial | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 967 | 374 |
Acquired Non-Impaired and Originated Loans | Installment and Other |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 32 | 328 |
Non-accrual | 14 | 328 |
Current | 3,734 | 2,057 |
Total loans and leases | 3,766 | 2,385 |
Acquired Non-Impaired and Originated Loans | Installment and Other | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 18 |  |
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,486 | 2,905 |
Non-accrual | 851 | 445 |
Current | 175,200 | 156,061 |
Total loans and leases | 177,686 | 158,966 |
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 997 | 2,070 |
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | $ 638 | $ 390 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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