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Guarantees (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Commitments to Extend Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | $ 290,818 | $ 296,442 | $ 292,839
Fair Value | 0 | 0 | 0
Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | 3,373 | 3,445 | 3,137
Fair Value | $ 25 | $ 30 | $ 24
Minimum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loans And Leases Receivable, Loan Commitments, Fixed Fees, Percent | 1.00% |  |
Maximum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loans And Leases Receivable, Loan Commitments, Fixed Fees, Percent | 3.00% |  |

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