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Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Securities [Abstract]  
Amortized Costs and Fair Value of Securities Available-for-Sale
Amortized costs and fair values of securities available-for-sale as of the dates indicated are as follows:

  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
Losses
  
Fair
Value
 
  
(in thousands)
 
June 30, 2018
            
U.S. Treasury securities
 
$
6,844
  
$
-
  
$
(26
)
 
$
6,818
 
Obligations of  U.S. Government agencies
  
11,519
   
-
   
(160
)
  
11,359
 
Obligations of state and political subdivisions
  
51,846
   
111
   
(716
)
  
51,241
 
Mortgage-backed securities
  
71,152
   
-
   
(2,893
)
  
68,259
 
Money market investments
  
1,326
   
-
   
-
   
1,326
 
Corporate bonds and other securities
  
3,950
   
44
   
(16
)
  
3,978
 
Total
 
$
146,637
  
$
155
  
$
(3,811
)
 
$
142,981
 
                 
December 31, 2017
                
Obligations of  U.S. Government agencies
 
$
9,530
  
$
27
  
$
(122
)
 
$
9,435
 
Obligations of state and political subdivisions
  
64,413
   
489
   
(137
)
  
64,765
 
Mortgage-backed securities
  
75,906
   
-
   
(1,610
)
  
74,296
 
Money market investments
  
1,194
   
-
   
-
   
1,194
 
Corporate bonds and other securities
  
7,049
   
195
   
(10
)
  
7,234
 
Other marketable equity securities
  
100
   
97
   
-
   
197
 
Total
 
$
158,192
  
$
808
  
$
(1,879
)
 
$
157,121
 
Gross Realized Gains and (Losses) on Sale of Investments
The following table summarizes net realized gains and losses on the sale of investment securities during the periods indicated (dollars in thousands):

 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
Securities Available-for-sale
        
Realized gains on sales of securities
 
$
51
  
$
87
  
$
131
  
$
87
 
Realized losses on sales of securities
  
(11
)
  
-
   
(11
)
  
-
 
Net realized gain
 
$
40
  
$
87
  
$
120
  
$
87
 
Available-for-Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position
The following table shows the gross unrealized losses and fair value of the Company's investments with unrealized losses that are not deemed to be other-than-temporarily impaired as of June 30, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of the dates indicated:

June 30, 2018
 
 
Less Than Twelve Months
  
More Than Twelve Months
 
Total
 
 
Gross
Unrealized
Losses
 
Fair
Value
  
Gross
Unrealized
Losses
  
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
 
(dollars in thousands)
 
Securities Available-for-Sale
            
U.S. Treasury securities
 
$
26
  
$
6,818
  
$
-
  
$
-
  
$
26
  
$
6,818
 
Obligations of U.S. Government agencies
  
37
   
7,678
   
123
   
3,481
   
160
   
11,159
 
Obligations of state and political subdivisions
  
332
   
20,739
   
384
   
10,625
   
716
   
31,364
 
Mortgage-backed securities
  
130
   
4,170
   
2,763
   
64,089
   
2,893
   
68,259
 
Corporate bonds
  
4
   
996
   
12
   
188
   
16
   
1,184
 
Total securities available-for-sale
 
$
529
  
$
40,401
  
$
3,282
  
$
78,383
  
$
3,811
  
$
118,784
 

December 31, 2017
 
 
Less Than Twelve Months
 
More Than Twelve Months
 
Total
 
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
 
(dollars in thousands)
 
Securities Available-for-Sale
            
Obligations of U.S. Government agencies
 
$
11
  
$
3,189
  
$
111
  
$
3,089
  
$
122
  
$
6,278
 
Obligations of state and political subdivisions
  
32
   
11,141
   
105
   
10,999
   
137
   
22,140
 
Mortgage-backed securities
  
67
   
9,742
   
1,543
   
64,554
   
1,610
   
74,296
 
Corporate bonds
  
2
   
1,098
   
8
   
792
   
10
   
1,890
 
Total securities available-for-sale
 
$
112
  
$
25,170
  
$
1,767
  
$
79,434
  
$
1,879
  
$
104,604