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Investments (Tables)
 6 Months Ended
Jun. 30, 2017
Investments [Abstract]  
Summary of amortized cost, gross unrealized gains and losses, and fair value of investment securities
The amortized cost, gross unrealized gains and losses, and fair value of investment securities at June 30, 2017 and December 31, 2016 were as follows (in thousands):

     
Gross
  
Gross
    
  
Amortized
  
Unrealized
  
Unrealized
  
Fair
 
June 30, 2017
 
Cost
  
Gains
  
Losses
  
Value
 
Available-for-sale securities:
            
  U.S. agency securities
 
$
142,581
  
$
315
  
$
(146
)
 
$
142,750
 
  Obligations of state and
                
    political subdivisions
  
84,731
   
1,578
   
(93
)
  
86,216
 
  Corporate obligations
  
3,000
   
111
   
-
   
3,111
 
  Mortgage-backed securities in
                
    government sponsored entities
  
41,489
   
147
   
(176
)
  
41,460
 
  Equity securities in financial institutions
  
900
   
771
   
-
   
1,671
 
Total available-for-sale securities
 
$
272,701
  
$
2,922
  
$
(415
)
 
$
275,208
 
                 
December 31, 2016
                
Available-for-sale securities:
                
  U.S. agency securities
 
$
170,276
  
$
407
  
$
(269
)
 
$
170,414
 
  U.S. treasury securities
  
2,999
   
1
   
-
   
3,000
 
  Obligations of state and
                
    political subdivisions
  
95,956
   
1,463
   
(493
)
  
96,926
 
  Corporate obligations
  
3,000
   
50
   
-
   
3,050
 
  Mortgage-backed securities in
                
    government sponsored entities
  
37,987
   
88
   
(347
)
  
37,728
 
  Equity securities in financial institutions
  
1,821
   
1,078
   
-
   
2,899
 
Total available-for-sale securities
 
$
312,039
  
$
3,087
  
$
(1,109
)
 
$
314,017
 
Unrealized losses and fair value of investments
The following table shows the Company's gross unrealized losses and fair value of the Company's investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time, which individual securities have been in a continuous unrealized loss position, at June 30, 2017 and December 31, 2016 (in thousands). As of June 30, 2017, the Company owned 63 securities whose fair value was less than their cost basis.
 

  
Less than Twelve Months
  
Twelve Months or Greater
  
Total
 
     
Gross
     
Gross
     
Gross
 
  
Fair
  
Unrealized
  
Fair
  
Unrealized
  
Fair
  
Unrealized
 
  June 30, 2017
 
Value
  
Losses
  
Value
  
Losses
  
Value
  
Losses
 
U.S. agency securities
 
$
53,010
  
$
(142
)
 
$
995
  
$
(4
)
 
$
54,005
  
$
(146
)
Obligations of state and
                        
    political subdivisions
  
7,811
   
(40
)
  
5,171
   
(53
)
  
12,982
   
(93
)
Mortgage-backed securities in
                        
   government sponsored entities
  
18,873
   
(149
)
  
1,377
   
(27
)
  
20,250
   
(176
)
    Total securities
 
$
79,694
  
$
(331
)
 
$
7,543
  
$
(84
)
 
$
87,237
  
$
(415
)
                         
December 31, 2016
                        
U.S. agency securities
 
$
50,947
  
$
(269
)
 
$
-
  
$
-
  
$
50,947
  
$
(269
)
Obligations of states and
                        
     political subdivisions
  
28,398
   
(472
)
  
767
   
(21
)
  
29,165
   
(493
)
Mortgage-backed securities in
                        
   government sponsored entities
  
26,717
   
(330
)
  
753
   
(17
)
  
27,470
   
(347
)
    Total securities
 
$
106,062
  
$
(1,071
)
 
$
1,520
  
$
(38
)
 
$
107,582
  
$
(1,109
)
Gross gains and losses on available-for-sale securities
The gross gains and losses were as follows (in thousands):

  
Three Months Ended
  
Six Months Ended
 
  
June 30,
  
June 30,
 
 
 
2017
  
2016
  
2017
  
2016
 
Gross gains
 
$
30
  
$
128
  
$
202
  
$
155
 
Gross losses
  
(7
)
  
-
   
(7
)
  
-
 
Net gains
 
$
23
  
$
128
  
$
195
  
$
155
 
Summary of amortized cost and fair value of debt securities by contractual maturity
The amortized cost and fair value of debt securities (excludes equity securities) at June 30, 2017, by contractual maturity, are shown below (in thousands):

  
Amortized
    
 
 
Cost
  
Fair Value
 
Available-for-sale debt securities:
      
  Due in one year or less
 
$
46,659
  
$
46,812
 
  Due after one year through five years
  
130,797
   
131,827
 
  Due after five years through ten years
  
37,314
   
37,598
 
  Due after ten years
  
57,031
   
57,300
 
Total
 
$
271,801
  
$
273,537