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Income Taxes - Components of net deferred income tax benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Deferred income tax benefits: |  |
Accrued deferred compensation | $ 87 | $ 78
Allowance for credit losses | 243 | 347
Net operating loss carryforward credits | 153 | 345
Accumulated depreciation | (13) |
Accumulated depreciation |  | 4
Reserve for unfunded commitments | 10 | 10
Accounting standard 310-20 | (103) | (76)
Right of use asset | (205) |
Lease liability | 205 |
Other temporary differences |  | 7
Accumulated securities premium accretion | 215 | 210
Net unrealized depreciation on investment securities available for sale | 80 | 467
Net deferred income tax benefits | $ 672 | $ 1,392

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