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Commitments and Contingencies (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Probable loan loss experience on unfunded obligations [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Estimate of possible loss | $ 276,000 | $ 326,000
Commitments to extend credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | 285,114,000 | 350,141,000
Undisbursed lines of credit |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | $ 283,602,000 | 347,001,000
Undisbursed lines of credit | Minimum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit, term of agreement | 1 month |
Undisbursed lines of credit | Maximum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit, term of agreement | 12 months |
Undisbursed portions of construction loans |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | $ 68,826,000 | 88,658,000
Standby letters of credit and financial guarantees |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | $ 1,512,000 | $ 3,140,000
Standby letters of credit and financial guarantees | Maximum |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit, term of agreement | 1 year |

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