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8. Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Components of Income Tax Expense (Benefit)
(Dollars in thousands)                  
    2015     2014     2013  
Current expense   $ 2,427       1,759       1,345  
Deferred income tax expense     673       178       534  
Total income tax   $ 3,100       1,937       1,879  
Schedule of Effective Income Tax Rate Reconciliation
(Dollars in thousands)                  
    2015     2014     2013  
Tax expense at statutory rate (34%)   $ 4,329       3,851       2,914  
State income tax, net of federal income tax effect     494       (283 )     428  
Tax-exempt interest income     (1,682 )     (1,630 )     (1,481 )
Increase in cash surrender value of life insurance     (143 )     (143 )     (147 )
Nondeductible interest and other expense     103       119       141  
Other     (1 )     23       24  
Total   $ 3,100       1,937       1,879  
Schedule of Deferred Tax Assets and Liabilities

(Dollars in thousands)            
    2015     2014  
Deferred tax assets:            
Allowance for loan losses   $ 3,513       4,134  
Accrued retirement expense     1,574       1,529  
Other real estate     33       206  
Federal credit carryforward     -       342  
State credit carryforward     -       327  
Restricted stock     417       243  
Accrued bonuses     238       224  
Interest income on nonaccrual loans     88       56  
Other than temporary impairment     374       186  
Other     16       152  
Total gross deferred tax assets     6,253       7,399  
                 
Deferred tax liabilities:                
Deferred loan fees     588       433  
Accumulated depreciation     172       728  
Prepaid expenses     59       101  
Other     70       100  
Unrealized gain on available for sale securities     3,308       3,479  
Total gross deferred tax liabilities     4,197       4,841  
                 
Net deferred tax asset   $ 2,056       2,558