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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Risk Rating Categories of Loans and Leases Considered for Inclusion in Allowance for Loan and Lease Losses Calculation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | $ 2,277,492 | $ 2,148,011 | $ 1,345,437
Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 891,693 | 796,344 | 533,695
Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 577,218 | 610,738 | 484,335
Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 105,429 | 140,766 | 40,232
Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 521,238 | 438,238 | 165,696
Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 4,228 | 2,959 | 1,926
Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 177,686 | 158,966 | $ 119,553
Loans Excluding Acquired Impaired Loans |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,949,802 | 1,743,974 |
Loans Excluding Acquired Impaired Loans | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 724,981 | 589,041 |
Loans Excluding Acquired Impaired Loans | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 432,656 | 435,021 |
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 99,483 | 133,787 |
Loans Excluding Acquired Impaired Loans | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 511,230 | 424,774 |
Loans Excluding Acquired Impaired Loans | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,766 | 2,385 |
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 177,686 | 158,966 |
Loans Excluding Acquired Impaired Loans | Pass |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,704,311 | 1,614,595 |
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 638,066 | 536,499 |
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 398,743 | 419,880 |
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 73,935 | 129,732 |
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 415,163 | 369,136 |
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,732 | 2,052 |
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 174,672 | 157,296 |
Loans Excluding Acquired Impaired Loans | Watch |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 176,996 | 105,689 |
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 58,217 | 38,707 |
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 29,165 | 10,885 |
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 22,380 | 2,897 |
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 67,024 | 52,872 |
Loans Excluding Acquired Impaired Loans | Watch | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 20 | 4 |
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 190 | 324 |
Loans Excluding Acquired Impaired Loans | Special Mention |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 34,892 | 11,422 |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 14,645 | 5,377 |
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,251 | 3,116 |
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,168 | 1,158 |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 13,535 | 1,258 |
Loans Excluding Acquired Impaired Loans | Special Mention | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases |  | 1 |
Loans Excluding Acquired Impaired Loans | Special Mention | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,293 | 512 |
Loans Excluding Acquired Impaired Loans | Substandard |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 33,331 | 12,173 |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 14,053 | 8,458 |
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,497 | 1,140 |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 15,508 | 1,508 |
Loans Excluding Acquired Impaired Loans | Substandard | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 14 | 328 |
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,259 | 739 |
Loans Excluding Acquired Impaired Loans | Doubtful |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 272 | 95 |
Loans Excluding Acquired Impaired Loans | Doubtful | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | $ 272 | $ 95 |

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