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Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details) - Originated Loans and Leases $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 2 | 4 | 2
Pre-Modification Outstanding Recorded Investment | $ 115 | $ 227 | $ 162
Post-Modification Outstanding Recorded Investment | $ 115 | $ 227 | $ 162
Number of Loans | loan | 0 | 0 | 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 55
Residential real estate | Home equity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 2 | 4 | 2
Pre-Modification Outstanding Recorded Investment | $ 115 | $ 227 | $ 162
Post-Modification Outstanding Recorded Investment | $ 115 | $ 227 | $ 162
Number of Loans | loan | 0 | 0 | 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 55

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