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Income Taxes - Components of net deferred income tax benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income tax benefits: |  |
Accrued deferred compensation | $ 78 | $ 92
Allowance for credit losses | 347 | 7
Nonaccrual interest |  | 375
Alternative minimum tax credits |  | 1,191
Net operating loss carryforward credits | 345 | 297
Accumulated depreciation |  | (15)
Accumulated depreciation | 4 |
Other real estate owned |  | 3
Reserve for unfunded commitments | 10 | 7
Accounting standard 310-20 | (76) |
Other temporary differences | 7 | 20
Accumulated securities premium accretion | 210 | 213
Net unrealized depreciation on investment securities available for sale | 467 | 239
Net deferred income tax benefits | $ 1,392 | $ 2,429

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