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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Income Tax Provision to Statutory Rate |  |  |
Income tax computed at statutory federal rate | $ 1,778 | $ 1,783 | $ 2,909
Tax exempt interest income | (320) | (309) | (486)
Tax exempt earnings on bank-owned life insurance | (162) | (81) | (135)
Tax credits | (218) | (154) | (85)
Deferred tax adjustment related to reduction in U.S. federal statutory income income tax rate |  |  | 206
Nondeductible merger expenses | 164 |  |
Other items | 52 | (84) | (22)
Income tax expense | $ 1,294 | $ 1,155 | $ 2,387
Effective income tax rate | 15.00% | 14.00% | 28.00%

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