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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Originated Loans and Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | $ 11,648 | $ 11,837
Unpaid Principal Balance With No Related Allowance | 12,163 | 11,832
Recorded Investment With Related Allowance | 1,425 | 513
Unpaid Principal Balance With Related Allowance | 1,436 | 532
Related Allowance | 376 | 441
Recorded Investment | 13,073 | 12,350
Unpaid Principal Balance | 13,599 | 12,364
Total Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 3,441 | 3,421
Unpaid Principal Balance With No Related Allowance | 3,543 | 3,554
Recorded Investment With Related Allowance | 0 | 50
Unpaid Principal Balance With Related Allowance | 0 | 50
Related Allowance | 0 | 25
Recorded Investment | 3,441 | 3,471
Unpaid Principal Balance | 3,543 | 3,604
Commercial and industrial | Originated Loans and Leases | Other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 2,503 | 1,246
Unpaid Principal Balance With No Related Allowance | 2,597 | 1,250
Recorded Investment With Related Allowance | 1,425 | 513
Unpaid Principal Balance With Related Allowance | 1,436 | 532
Related Allowance | 376 | 441
Commercial and industrial | Total Acquired Loans | Other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 261 | 226
Unpaid Principal Balance With No Related Allowance | 353 | 226
Recorded Investment With Related Allowance | 0 | 50
Unpaid Principal Balance With Related Allowance | 0 | 50
Related Allowance | 0 | 25
Commercial real estate | Originated Loans and Leases | Other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 5,136 | 6,626
Unpaid Principal Balance With No Related Allowance | 5,336 | 6,533
Commercial real estate | Total Acquired Loans | Other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 1,400 | 1,372
Unpaid Principal Balance With No Related Allowance | 1,378 | 1,474
Residential real estate | Originated Loans and Leases | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 4,009 | 3,965
Unpaid Principal Balance With No Related Allowance | 4,230 | 4,049
Residential real estate | Total Acquired Loans | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 1,780 | 1,823
Unpaid Principal Balance With No Related Allowance | $ 1,812 | $ 1,854

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