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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 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | $ 4,374,517 | $ 3,785,661 | $ 3,831,090
Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,347,855 | 1,276,542 | 1,306,288
Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 633,396 | 711,822 | 749,103
Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 239,034 | 278,657 | 280,999
Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,328,809 | 1,331,565 | 1,302,162
Paycheck Protection Program ("PPP") |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 622,191 |  |
Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,143 | 6,565 | 9,354
Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 200,089 | 180,510 | $ 183,184
Loans Excluding Acquired Impaired Loans |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 4,157,699 | 3,526,993 |
Loans Excluding Acquired Impaired Loans | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,230,741 | 1,140,628 |
Loans Excluding Acquired Impaired Loans | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 549,199 | 611,599 |
Loans Excluding Acquired Impaired Loans | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 234,230 | 273,284 |
Loans Excluding Acquired Impaired Loans | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,318,320 | 1,314,656 |
Loans Excluding Acquired Impaired Loans | Paycheck Protection Program ("PPP") |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 622,191 |  |
Loans Excluding Acquired Impaired Loans | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,929 | 6,316 |
Loans Excluding Acquired Impaired Loans | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 200,089 | 180,510 |
Loans Excluding Acquired Impaired Loans | Pass |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,509,645 | 3,088,584 |
Loans Excluding Acquired Impaired Loans | Pass | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 987,053 | 984,881 |
Loans Excluding Acquired Impaired Loans | Pass | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 516,858 | 584,363 |
Loans Excluding Acquired Impaired Loans | Pass | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 203,630 | 247,775 |
Loans Excluding Acquired Impaired Loans | Pass | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 981,626 | 1,087,856 |
Loans Excluding Acquired Impaired Loans | Pass | Paycheck Protection Program ("PPP") |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 622,191 |  |
Loans Excluding Acquired Impaired Loans | Pass | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,664 | 6,013 |
Loans Excluding Acquired Impaired Loans | Pass | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 195,623 | 177,696 |
Loans Excluding Acquired Impaired Loans | Watch |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 473,678 | 299,432 |
Loans Excluding Acquired Impaired Loans | Watch | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 165,769 | 99,803 |
Loans Excluding Acquired Impaired Loans | Watch | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 26,674 | 21,856 |
Loans Excluding Acquired Impaired Loans | Watch | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 29,171 | 18,181 |
Loans Excluding Acquired Impaired Loans | Watch | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 251,750 | 159,282 |
Loans Excluding Acquired Impaired Loans | Watch | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 264 | 302 |
Loans Excluding Acquired Impaired Loans | Watch | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 50 | 8 |
Loans Excluding Acquired Impaired Loans | Special Mention |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 95,992 | 64,559 |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 36,614 | 27,484 |
Loans Excluding Acquired Impaired Loans | Special Mention | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 3,583 | 3,648 |
Loans Excluding Acquired Impaired Loans | Special Mention | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,429 | 4,684 |
Loans Excluding Acquired Impaired Loans | Special Mention | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 51,891 | 26,944 |
Loans Excluding Acquired Impaired Loans | Special Mention | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,475 | 1,799 |
Loans Excluding Acquired Impaired Loans | Substandard |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 77,907 | 74,139 |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 41,305 | 28,460 |
Loans Excluding Acquired Impaired Loans | Substandard | Residential Real Estate |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 2,084 | 1,732 |
Loans Excluding Acquired Impaired Loans | Substandard | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases |  | 2,644 |
Loans Excluding Acquired Impaired Loans | Substandard | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 33,053 | 40,574 |
Loans Excluding Acquired Impaired Loans | Substandard | Installment and Other |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1 | 1 |
Loans Excluding Acquired Impaired Loans | Substandard | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 1,464 | 728 |
Loans Excluding Acquired Impaired Loans | Doubtful |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | 477 | 279 |
Loans Excluding Acquired Impaired Loans | Doubtful | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total loans and leases | $ 477 | $ 279 |

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