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Investments (Tables)
 9 Months Ended
Sep. 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 September 30, 2017 and December 31, 2016 were as follows (in thousands):

     
Gross
  
Gross
    
  
Amortized
  
Unrealized
  
Unrealized
  
Fair
 
September 30, 2017
 
Cost
  
Gains
  
Losses
  
Value
 
Available-for-sale securities:
            
  U.S. agency securities
 
$
132,555
  
$
191
  
$
(195
)
 
$
132,551
 
  Obligations of state and
                
    political subdivisions
  
80,439
   
1,382
   
(98
)
  
81,723
 
  Corporate obligations
  
3,000
   
101
   
-
   
3,101
 
  Mortgage-backed securities in
                
    government sponsored entities
  
44,391
   
83
   
(197
)
  
44,277
 
  Equity securities in financial
                
     institutions
  
992
   
944
   
-
   
1,936
 
Total available-for-sale securities
 
$
261,377
  
$
2,701
  
$
(490
)
 
$
263,588
 
                 
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 September 30, 2017 and December 31, 2016 (in thousands). As of September 30, 2017, the Company owned 70 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
 
 September 30, 2017
 
Value
  
Losses
  
Value
  
Losses
  
Value
  
Losses
 
U.S. agency securities
 
$
55,048
  
$
(119
)
 
$
7,922
  
$
(76
)
 
$
62,970
  
$
(195
)
Obligations of state and
                        
    political subdivisions
  
6,146
   
(21
)
  
8,564
   
(77
)
  
14,710
   
(98
)
Mortgage-backed securities in
                        
   government sponsored entities
  
26,683
   
(166
)
  
2,810
   
(31
)
  
29,493
   
(197
)
    Total securities
 
$
87,877
  
$
(306
)
 
$
19,296
  
$
(184
)
 
$
107,173
  
$
(490
)
                         
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
  
Nine Months Ended
 
  
September 30,
  
September 30,
 
 
 
2017
  
2016
  
2017
  
2016
 
Gross gains
 
$
9
  
$
-
  
$
211
  
$
155
 
Gross losses
  
-
   
-
   
(7
)
  
-
 
Net gains
 
$
9
  
$
-
  
$
204
  
$
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 September 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
 
$
52,243
  
$
52,375
 
  Due after one year through five years
  
113,014
   
113,722
 
  Due after five years through ten years
  
35,712
   
35,950
 
  Due after ten years
  
59,416
   
59,605
 
Total
 
$
260,385
  
$
261,652