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Income Taxes - Components of net deferred income tax benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax benefits: |  |
Accrued deferred compensation | $ 92 | $ 146
Allowance for credit losses | 7 | 95
Nonaccrual interest | 375 | 445
Alternative minimum tax credits | 1,191 | 967
Net operating loss carryforward credits | 297 | 665
Accumulated depreciation | (15) |
Accumulated depreciation |  | 54
Other real estate owned | 3 | 18
Reserve for unfunded commitments | 7 | 10
Other temporary differences | 20 | 22
Accumulated securities premium accretion | 213 | 211
Net unrealized depreciation on investment securities available for sale | 239 | 527
Deferred income tax liabilities: |  |
Deferred Tax Assets, Net, Total | $ 2,429 | $ 3,160

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