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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities recorded at fair value on a recurring basis
                 
Fair Value Measurements
         
(in thousands)
   
Fair Value
   
Quoted Prices 
in Active 
Markets for 
Identical 
Assets 
(Level 1)
   
Other 
Observable 
Inputs 
(Level 2)
   
Significant
Unobservable
Inputs
(Level 3)
         
December 31, 2017                          
Assets:
                                                         
U.S. Treasury
      $ 1,967         $          1,967           0         $ 0            
U.S. government and federal agency obligations
        12,073           0           12,073           0            
Government sponsored enterprises
        36,897           0           36,847           0            
Obligations of states and political subdivisions
        46,656           0           46,656           0            
Mortgage-backed securities
        128,949           0           128,949           0            
Mortgage servicing rights
        2,713           0           0           2,713            
Total
      $ 229,255         $ 1,967         $ 213,221         $ 2,713            
December 31, 2016                          
Assets:
                                                         
U.S. government and federal agency obligations
      $ 13,364         $          0           13,364         $ 0            
Government sponsored enterprises
        32,459           0           32,459           0            
Obligations of states and political subdivisions
        42,032           0           42,032           0            
Mortgage-backed securities
        126,657           0           126,657           0            
Mortgage servicing rights
        2,584           0           0           2,584            
Total
      $ 217,096         $ 0         $ 214,512         $ 2,584            
 
Schedule of summary of changes in Level 3 assets and liabilities measured at fair value on a recurring basis
(in thousands)
   
Fair Value 
Measurements 
Using Significant 
Unobservable 
Inputs (Level 3) 
Mortgage 
Servicing Rights
 
Balance at December 31, 2015
      $    2,847    
Total gains or (losses) (realized/unrealized):              
Included in earnings
        (529)    
Included in other comprehensive income
        0    
Purchases         0    
Sales         0    
Issues         266    
Settlements         0    
Balance at December 31, 2016
      $ 2,584    
Total gains or (losses) (realized/unrealized):              
Included in earnings
        (93)    
Included in other comprehensive income
        0    
Purchases         0    
Sales         0    
Issues         222    
Settlements         0    
Balance at December 31, 2017
      $ 2,713    
 
Schedule of change in valuation of mortgage servicing rights arising from inputs and assumptions
     
Quantitative Information about Level 3 Fair Value 
Measurements
                         
     
Valuation Technique
   
Unobservable Inputs
   
Input Value
 
                 
2017
   
2016
 
Mortgage servicing rights    
Discounted cash flows
    Weighted-Average Constant Prepayment Rate         9.73%           10.68%    
            Weighted-Average Note Rate         3.85%           3.85%    
            Weighted-Average Discount Rate         10.09%           9.69%    
            Weighted-Average Expected Life (in years)         5.90           5.60    
Schedule of valuation methods for instruments measured at fair value on a nonrecurring basis
     
Fair Value Measurements Using
 
(in thousands)
   
Total 
Fair Value
   
Quoted Prices 
in Active 
Markets for 
Identical 
Assets 
(Level 1)
   
Other 
Observable 
Inputs 
(Level 2)
   
Significant 
Unobservable 
Inputs 
(Level 3)
   
Total Gains 
(Losses) *
 
December 31, 2017  
Assets:                                                              
Impaired loans:                                                              
Commercial, financial, & agricultural       $ 1,114         $ 0         $ 0         $ 1,114         $ (521)    
Real estate construction - commercial         49           0           0           49           0    
Real estate mortgage - residential         3,877           0           0           3,877           (204)    
Real estate mortgage - commercial         1,395           0           0           1,395           (26)    
Consumer         155           0           0           155           (37)    
Total
      $ 6,590         $ 0         $ 0         $ 6,590         $     (788)    
Other real estate owned and repossessed assets
      $    13,182         $          0         $             0         $    13,182         $ (250)    
   
December 31, 2016  
Assets:                                                              
Impaired loans:                                                              
Commercial, financial, & agricultural       $ 584         $ 0         $ 0         $ 584         $ (421)    
Real estate construction - commercial         42           0           0           42           0    
Real estate mortgage - residential         3,602           0           0           3,602           (316)    
Real estate mortgage - commercial         1,641           0           0           1,641           (257)    
Consumer         81           0           0           81           (35)    
Total
      $ 5,950         $ 0         $ 0         $ 5,950         $ (1,029)    
Other real estate owned and repossessed assets
      $ 14,162         $ 0         $ 0         $ 14,162         $ 25    
*      Total gains (losses) reported for other real estate owned and repossessed assets includes charge-offs, valuation write-downs, and net losses taken during the periods reported.