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Federal Income Taxes (Tables)
 9 Months Ended
Sep. 30, 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 the Tax Act, is as follows for the:

Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2018
 
2017
 
2018
 
2017
Income taxes at statutory rate (21% in 2018 and 34% in 2017)
$
851

 
$
1,458

 
$
2,389

 
$
4,317

Effect of nontaxable income
 
 
 
 
 
 
 
Interest income on tax exempt municipal securities
(259
)
 
(452
)
 
(797
)
 
(1,361
)
Earnings on corporate owned life insurance policies
(35
)
 
(60
)
 
(109
)
 
(183
)
Effect of tax credits
(200
)
 
(186
)
 
(601
)
 
(566
)
Other
(6
)
 
(18
)
 
(25
)
 
(54
)
Total effect of nontaxable income
(500
)
 
(716
)
 
(1,532
)
 
(2,164
)
Effect of nondeductible expenses
8

 
8

 
30

 
27

Federal income tax expense
$
359

 
$
750

 
$
887

 
$
2,180