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Federal Income Taxes (Tables)
9 Months Ended
Sep. 30, 2020
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 is as follows for the:
Three Months Ended 
 September 30
Nine Months Ended 
 September 30
2020201920202019
Income taxes at statutory rate$1,069 $1,065 $2,752 $2,866 
Effect of nontaxable income
Interest income on tax exempt municipal securities(176)(224)(570)(704)
Earnings on corporate owned life insurance policies(40)(39)(301)(118)
Other(4)(4)(12)(12)
Total effect of nontaxable income(220)(267)(883)(834)
Effect of nondeductible expenses14 14 27 
Effect of tax credits(122)(182)(388)(539)
Federal income tax expense$734 $630 $1,495 $1,520