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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
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Mar. 31, 2018 USD ($) loan | Mar. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 63 | $ 73
Post-Modification Outstanding Recorded Investment | $ 63 | $ 73
Number of Loans | loan | 0 | 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 55
Residential real estate | Home equity |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 63 | $ 73
Post-Modification Outstanding Recorded Investment | $ 63 | $ 73
Number of Loans | loan | 0 | 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 55

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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