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Guarantees (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Commitments to Extend Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | $ 328,774 | $ 315,256 | $ 294,618
Fair Value | 0 | 0 | 0
Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | 3,584 | 3,526 | 3,371
Fair Value | $ 24 | $ 23 | $ 28
Minimum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loan commitments, fixed fee percent | 1.00% |  |
Maximum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loan commitments, fixed fee percent | 3.00% |  |

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