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Loans Modified in Trouble Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | 6 | 8 | 4
Pre-Modification Outstanding Recorded Investment | $ 82 | $ 1,279 | $ 39
Post-Modification Outstanding Recorded Investment | $ 82 | $ 1,279 | $ 39
Subsequent Default, Number of Contracts | 0 | 0 | 0
Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 0
Commitments to lend additional funds to modified loans | $ 0 | $ 0 | $ 0
Commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | 1 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 38 | $ 503 | $ 0
Post-Modification Outstanding Recorded Investment | $ 38 | $ 503 | $ 0
Subsequent Default, Number of Contracts | 0 | 0 | 0
Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 0
Commitments to lend additional funds to modified loans | $ 0 | $ 0 | $ 0
Commercial Real Estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 725 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 725 | $ 0
Subsequent Default, Number of Contracts | 0 | 0 | 0
Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 0
Commitments to lend additional funds to modified loans | $ 0 | $ 0 | $ 0
Other Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | 5 | 6 | 4
Pre-Modification Outstanding Recorded Investment | $ 44 | $ 51 | $ 39
Post-Modification Outstanding Recorded Investment | $ 44 | $ 51 | $ 39
Subsequent Default, Number of Contracts | 0 | 0 | 0
Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 0
Commitments to lend additional funds to modified loans | $ 0 | $ 0 | $ 0
Residential Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0
Subsequent Default, Number of Contracts | 0 | 0 | 0
Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 0
Commitments to lend additional funds to modified loans | $ 0 | $ 0 | $ 0
Minimum | Other Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Principal repayment terms, period | 1 year |  |
Minimum | Automobile Loan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Principal repayment terms, period | 3 years |  |
Maximum | Other Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Principal repayment terms, period | 5 years |  |
Maximum | Automobile Loan |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Principal repayment terms, period | 7 years |  |

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