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8. Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Components of income tax expense (benefit)
(Dollars in thousands)         
   2018  2017  2016
Current expense  $2,546    1,827    1,464 
Deferred income tax expense   78    2,120    1,097 
Total income tax  $2,624    3,947    2,561 
Schedule of effective income Tax rate reconciliation
(Dollars in thousands)         
   2018  2017  2016
Tax expense at statutory rate (21% in 2018)  $3,361    4,833    3,991 
State income tax, net of federal income tax effect   358    307    339 
Tax-exempt interest income   (990)   (1,594)   (1,681)
Increase in cash surrender value of life insurance   (81)   (136)   (138)
Nondeductible interest and other expense   23    46    78 
Impact of TCJA   —      588    —   
Other   (47)   (97)   (28)
Total  $2,624    3,947    2,561 
Schedule of deferred tax assets and liabilities
(Dollars in thousands)      
   2018  2017
Deferred tax assets:          
Allowance for loan losses  $1,481    1,463 
Accrued retirement expense   1,119    1,073 
Federal credit carryforward   —      88 
Restricted stock   262    243 
Accrued bonuses   211    171 
Interest income on nonaccrual loans   1    5 
Other than temporary impairment   —      9 
Total gross deferred tax assets   3,074    3,052 
           
Deferred tax liabilities:          
Deferred loan fees   379    365 
Accumulated depreciation   610    498 
Prepaid expenses   10    14 
Other   5    28 
Unrealized gain on available for sale securities   294    1,072 
Total gross deferred tax liabilities   1,298    1,977 
           
Net deferred tax asset  $1,776    1,075