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Federal Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of federal income tax expense | The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense, which has significantly changed as a result of 2017 Tax Act, is as follows for the:
| Three Months Ended March 31
| 2018 |  | 2017
Income taxes at statutory rate (21% in 2018 and 34% in 2017) | $ | 783 |  |  | $ | 1,247 |
Effect of nontaxable income |  |  |
Interest income on tax exempt municipal securities | (274 | ) |  | (455 | )
Earnings on corporate owned life insurance policies | (36 | ) |  | (61 | )
Effect of tax credits | (200 | ) |  | (189 | )
Other | (11 | ) |  | (18 | )
Total effect of nontaxable income | (521 | ) |  | (723 | )
Effect of nondeductible expenses | 3 |  |  | 8 |
Federal income tax expense | $ | 265 |  |  | $ | 532 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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