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Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Originated Loans and Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | $ 12,752 | $ 11,930
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 877 | 752
Interest Income Recognized With Related Allowance | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 13,629 | 12,682
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0
Total Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 3,542 | 4,322
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 37 | 137
Interest Income Recognized With Related Allowance | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 3,579 | 4,459
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 2,399 | 280
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 864 | 155
Interest Income Recognized With Related Allowance | 0 | 0
Commercial and industrial | Total Acquired Loans | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 265 | 165
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 37 | 0
Interest Income Recognized With Related Allowance | 0 | 0
Commercial real estate | Originated Loans and Leases | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 6,373 | 8,162
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 13 | 597
Interest Income Recognized With Related Allowance | 0 | 0
Commercial real estate | Total Acquired Loans | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 1,469 | 2,746
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 0 | 77
Interest Income Recognized With Related Allowance | 0 | 0
Residential real estate | Originated Loans and Leases | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 3,980 | 3,488
Interest Income Recognized With No Related Allowance | 0 | 0
Residential real estate | Total Acquired Loans | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment With No Related Allowance | 1,808 | 1,411
Interest Income Recognized With No Related Allowance | 0 | 0
Average Recorded Investment With Related Allowance | 0 | $ 60
Interest Income Recognized With Related Allowance | $ 0 |

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