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8. Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of Income Tax Expense (Benefit)
(Dollars in thousands)                  
    2017     2016     2015  
Current expense   $ 1,827       1,464       2,427  
Deferred income tax expense     2,120       1,097       673  
Total income tax   $ 3,947       2,561       3,100  
Schedule of Effective Income Tax Rate Reconciliation
(Dollars in thousands)                  
    2017     2016     2015  
Tax expense at statutory rate (34%)   $ 4,833       3,991       4,329  
State income tax, net of federal income tax effect     307       339       494  
Tax-exempt interest income     (1,594 )     (1,681 )     (1,682 )
Increase in cash surrender value of life insurance     (136 )     (138 )     (143 )
Nondeductible interest and other expense     46       78       103  
Impact of Tax Cuts and Jobs Act     588       -       -  
Other     (97 )     (28 )     (1 )
Total   $ 3,947       2,561       3,100  
Schedule of Deferred Tax Assets and Liabilities
(Dollars in thousands)            
    2017     2016  
Deferred tax assets:            
Allowance for loan losses   $ 1,463       2,717  
Accrued retirement expense     1,073       1,616  
Other real estate     -       -  
Federal credit carryforward     88       326  
State credit carryforward     -       14  
Restricted stock     243       745  
Accrued bonuses     171       216  
Interest income on nonaccrual loans     5       27  
Other than temporary impairment     9       14  
Other     -     23  
Total gross deferred tax assets     3,052       5,698  
                 
Deferred tax liabilities:                
Deferred loan fees     365       797  
Accumulated depreciation     498       532  
Prepaid expenses     14       78  
Other     28       23  
Unrealized gain on available for sale securities     1,072       1,807  
Total gross deferred tax liabilities     1,977       3,237  
                 
Net deferred tax asset   $ 1,075       2,461