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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]  
Schedule of amortized cost, contractual maturity, gross unrealized gains and losses, and fair value of debt securities classified as available-for-sale
  Total          
  Amortized  Gross Unrealized  Fair 
(in thousands) Cost  Gains  Losses  Value 
June 30, 2017                
U.S. government and federal agency obligations $12,945  $0  $(233) $12,712 
Government sponsored enterprises  37,568   0   (256)  37,312 
Obligations of states and political subdivisions  48,031   261   (298)  47,994 
Mortgage-backed securities:                
Residential - government agencies  118,491   157   (1,315)  117,333 
Commercial - government agencies  990   12   0   1,002 
Total mortgage-backed securities  119,481   169   (1,315)  118,335 
Total available-for-sale securities $218,025  $430  $(2,102) $216,353 
                 
December 31, 2016                
U.S. government and federal agency obligations $13,667  $0  $(303) $13,364 
Government sponsored enterprises  32,786   2   (329)  32,459 
Obligations of states and political subdivisions  42,666   123   (757)  42,032 
Mortgage-backed securities:                
Residential - government agencies  127,527   124   (1,995)  125,656 
Commercial - government agencies  989   12   0   1,001 
Total mortgage-backed securities  128,516   136   (1,995)  126,657 
Total available-for-sale securities $217,635  $261  $(3,384) $214,512 
Schedule of amortized cost and fair value of debt securities classified as available-for-sale by contractual maturity
  Amortized  Fair 
(in thousands) Cost  Value 
Due in one year or less $5,781  $5,832 
Due after one year through five years  60,749   60,531 
Due after five years through ten years  26,266   25,956 
Due after ten years  5,748   5,699 
Total  98,544   98,018 
Mortgage-backed securities  119,481   118,335 
Total available-for-sale securities $218,025  $216,353 
Schedule of gross unrealized losses on debt securities and fair value of related securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
  Less than 12 months  12 months or more  Total  Total 
  Fair  Unrealized  Fair  Unrealized  Fair  Unrealized 
(in thousands) Value  Losses  Value  Losses  Value  Losses 
At June 30, 2017                        
U.S. government and federal agency obligations $7,788  $(133) $4,925  $(100) $12,713  $(233)
Government sponsored enterprises  32,339   (229)  2,473   (27)  34,812   (256)
Obligations of states and political subdivisions  22,886   (264)  1,912   (34)  24,798   (298)
Mortgage-backed securities:                        
Residential - government agencies  77,979   (924)  20,188   (391)  98,167   (1,315)
Total $140,992  $(1,550) $29,498  $(552) $170,490  $(2,102)
                         
(in thousands)                        
At December 31, 2016                        
U.S. government and federal agency obligations $13,365  $(303) $0  $0  $13,365  $(303)
Government sponsored enterprises  29,432   (329)  0   0   29,432   (329)
Obligations of states and political subdivisions  32,318   (757)  0   0   32,318   (757)
Mortgage-backed securities:                        
Residential - government agencies  109,772   (1,848)  3,742   (147)  113,514   (1,995)
Total $184,887  $(3,237) $3,742  $(147) $188,629  $(3,384)
Schedule of components of investment securities gains (losses), which are recognized in earnings
  Three Months Ended June 30,  Six Months Ended June 30, 
(in thousands) 2017  2016  2017  2016 
Gains realized on sales $0  $18  $0  $490 
Losses realized on sales  0   0   0   0 
Other-than-temporary impairment recognized  0   0   0   0 
Investment securities gains $0  $18  $0  $490