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Securities (Tables)
 9 Months Ended
Sep. 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)
 
September 30, 2018
            
U.S. Treasury securities
 
$
9,338
  
$
-
  
$
(74
)
 
$
9,264
 
Obligations of  U.S. Government agencies
  
11,278
   
-
   
(240
)
  
11,038
 
Obligations of state and political subdivisions
  
50,101
   
50
   
(1,121
)
  
49,030
 
Mortgage-backed securities
  
71,090
   
-
   
(3,280
)
  
67,810
 
Money market investments
  
1,205
   
-
   
-
   
1,205
 
Corporate bonds and other securities
  
3,950
   
10
   
(19
)
  
3,941
 
Total
 
$
146,962
  
$
60
  
$
(4,734
)
 
$
142,288
 
                 
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
 
Net 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
Securities Available-for-sale
        
Realized gains on sales of securities
 
$
-
  
$
2
  
$
131
  
$
89
 
Realized losses on sales of securities
  
-
   
-
   
(11
)
  
-
 
Net realized gain
 
$
-
  
$
2
  
$
120
  
$
89
 
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 September 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:

September 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
 
$
74
  
$
9,264
  
$
-
  
$
-
  
$
74
  
$
9,264
 
Obligations of U.S. Government agencies
  
59
   
7,302
   
181
   
3,736
   
240
   
11,038
 
Obligations of state and political subdivisions
  
441
   
28,333
   
680
   
13,945
   
1,121
   
42,278
 
Mortgage-backed securities
  
35
   
2,362
   
3,245
   
65,448
   
3,280
   
67,810
 
Corporate bonds
  
6
   
2,644
   
13
   
287
   
19
   
2,931
 
Total securities available-for-sale
 
$
615
  
$
49,905
  
$
4,119
  
$
83,416
  
$
4,734
  
$
133,321
 

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