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Allowance for Loan and Lease Losses - Loans by Class Modified as Troubled Debt Restructurings (Details) - Originated Loans and Leases $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 7 | 6
Pre-Modification Outstanding Recorded Investment | $ 533 | $ 716
Post- Modification Outstanding Recorded Investment | $ 533 | $ 716
Number of Loans TDRs | loan | 0 | 1
Post- Modification Outstanding Recorded Investment TDRs | $ 0 | $ 55
Commercial real estate | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 |
Pre-Modification Outstanding Recorded Investment | $ 26 |
Post- Modification Outstanding Recorded Investment | $ 26 |
Number of Loans TDRs | loan | 0 |
Post- Modification Outstanding Recorded Investment TDRs | $ 0 |
Residential real estate | Home equity |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 6 | 6
Pre-Modification Outstanding Recorded Investment | $ 507 | $ 716
Post- Modification Outstanding Recorded Investment | $ 507 | $ 716
Number of Loans TDRs | loan | 0 | 1
Post- Modification Outstanding Recorded Investment TDRs | $ 0 | $ 55

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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