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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Contractual Delinquency Information (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | $ 4,374,517 | $ 3,785,661 | $ 3,831,090
Commercial Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 1,347,855 | 1,276,542 | 1,306,288
Residential Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 633,396 | 711,822 | 749,103
Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 239,034 | 278,657 | 280,999
Commercial and Industrial |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 1,328,809 | 1,331,565 | 1,302,162
Paycheck Protection Program ("PPP") |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 622,191 |  |
Installment and Other |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 3,143 | 6,565 | 9,354
Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total loans and leases | 200,089 | 180,510 | $ 183,184
Acquired Non-Impaired and Originated Loans |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 53,182 | 76,436 |
Non-accrual | 43,196 | 36,272 |
Current | 4,104,517 | 3,450,557 |
Total loans and leases | 4,157,699 | 3,526,993 |
Acquired Non-Impaired and Originated Loans | 30-59 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 7,672 | 25,963 |
Acquired Non-Impaired and Originated Loans | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,314 | 14,201 |
Acquired Non-Impaired and Originated Loans | Commercial Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 21,807 | 31,696 |
Non-accrual | 21,067 | 12,274 |
Current | 1,208,934 | 1,108,932 |
Total loans and leases | 1,230,741 | 1,140,628 |
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 | 282 | 14,269 |
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 | 458 | 5,153 |
Acquired Non-Impaired and Originated Loans | Residential Real Estate |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 3,855 | 5,018 |
Non-accrual | 1,843 | 1,371 |
Current | 545,344 | 606,581 |
Total loans and leases | 549,199 | 611,599 |
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 | 1,038 | 3,187 |
Acquired Non-Impaired and Originated Loans | Residential Real Estate | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 974 | 460 |
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,035 | 4,460 |
Current | 232,195 | 268,824 |
Total loans and leases | 234,230 | 273,284 |
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 | 2,035 |  |
Acquired Non-Impaired and Originated Loans | Construction, Land Development, and Other Land | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due |  | 4,460 |
Acquired Non-Impaired and Originated Loans | Commercial and Industrial |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 22,571 | 33,534 |
Non-accrual | 19,048 | 22,151 |
Current | 1,295,749 | 1,281,122 |
Total loans and leases | 1,318,320 | 1,314,656 |
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 | 3,417 | 7,789 |
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 | 106 | 3,594 |
Acquired Non-Impaired and Originated Loans | Paycheck Protection Program ("PPP") |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Current | 622,191 |  |
Total loans and leases | 622,191 |  |
Acquired Non-Impaired and Originated Loans | Installment and Other |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 8 | 136 |
Non-accrual | 1 | 1 |
Current | 2,921 | 6,180 |
Total loans and leases | 2,929 | 6,316 |
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 | 7 | 133 |
Acquired Non-Impaired and Originated Loans | Installment and Other | 60-89 Days Past Due |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due |  | 2 |
Acquired Non-Impaired and Originated Loans | Lease Financing Receivables |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Past Due | 2,906 | 1,592 |
Non-accrual | 1,237 | 475 |
Current | 197,183 | 178,918 |
Total loans and leases | 200,089 | 180,510 |
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 | 893 | 585 |
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 | $ 776 | $ 532 |

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