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Stockholders' Equity and Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity and Earnings Per Common Share [Abstract]  
Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), by Category
The following table presents information on amounts reclassified out of accumulated other comprehensive loss, by category, during the periods indicated:

  
Years Ended
  
  
December 31,
 
Affected Line Item on
 Consolidated Statement of Income
  
2016
  
2015
 
  
(in thousands)
  
Available-for-sale securities
           
Realized gains (losses) on sales of securities
 
$
522
  
$
76
 
  Gain (loss) on sale of available-for-sale securities, net
Tax effect
  
177
   
26
 
  Income tax (benefit) expense
  
$
345
  
$
50
  
Defined-benefit pension plan
             
Amortization of actuarial loss (1)
 
$
(504
)
 
$
(390
)
  Salaries and employee benefits
Tax effect
  
(171
)
  
(133
)
  Income tax benefit
  
$
(333
)
 
$
(257
)
 
               
Total reclassifications for the period
 
$
12
  
$
(207
)
 
 
(1) This accumulated other comprehensive loss component is included in the computation of net periodic pension cost (see Note 14. Pension Plan and 401(k) Plan for additional details).
Other Comprehensive Income
The following table presents the changes in accumulated other comprehensive loss, by category, net of tax, for the periods indicated:

 
 
Unrealized Gains (Losses) on Available-for-Sale Securities
  
Unrealized Losses on Securities Transferred from Available-for-Sale to Held-to-Maturity (1)
  
Defined Benefit Pension Plans
  
Accumulated Other Comprehensive Loss
 
  
(in thousands)
 
             
Balance at December 31, 2014
 
$
(78
)
 
$
(3,386
)
 
$
(2,429
)
 
$
(5,893
)
Net change for the year ended December 31, 2015
  
(498
)
  
3,386
   
(157
)
  
2,731
 
Balance at December 31, 2015
  
(576
)
  
0
   
(2,586
)
  
(3,162
)
                 
Net change for the year ended December 31, 2016
  
(1,163
)
  
0
   
117
   
(1,046
)
Balance at December 31, 2016
 
$
(1,739
)
 
$
0
  
$
(2,469
)
 
$
(4,208
)
  
(1) Net change for the year ended December 31, 2015 represents reclassification due to the transfer of securities held-to-maturity to available-for-sale. See Note 3. Securities.
 
Component of Other Comprehensive Income on a Pre-Tax and After-Tax
The following table presents the change in each component of other comprehensive income (loss) on a pre-tax and after-tax basis for the periods indicated.

  
Year Ended December 31, 2016
 
 
 
Pretax
  
Tax Effect
  
Net-of-Tax
 
  
(in thousands)
 
Unrealized losses on available-for-sale securities:
         
Unrealized holding losses arising during the period
 
$
(1,240
)
 
$
(422
)
 
$
(818
)
Reclassification adjustment for gains recognized in income
  
(522
)
  
(177
)
  
(345
)
Net unrealized losses on securities
  
(1,762
)
  
(599
)
  
(1,163
)
             
Defined benefit pension plans:
            
Net actuarial loss for the period
  
(327
)
  
(111
)
  
(216
)
Amortization of actuarial loss from prior period
  
504
   
171
   
333
 
Net change
  
177
   
60
   
117
 
             
Total change in accumulated other comprehensive loss
 
$
(1,585
)
 
$
(539
)
 
$
(1,046
)

  
Year Ended December 31, 2015
 
 
 
Pretax
  
Tax Effect
  
Net-of-Tax
 
  
(in thousands)
 
Unrealized losses on available-for-sale securities:
         
Unrealized holding losses arising during the period
 
$
(679
)
 
$
(231
)
 
$
(448
)
Reclassification adjustment for gains recognized in income
  
(76
)
  
(26
)
  
(50
)
Net change
  
(755
)
  
(257
)
  
(498
)
             
Unrealized losses on securities transferred from available-for-sale to held-to-maturity:
            
Elimination upon transfer back to available-for-sale
  
4,197
   
1,427
   
2,770
 
Amortization
  
934
   
318
   
616
 
Net change
  
5,131
   
1,745
   
3,386
 
             
Defined benefit pension plans:
            
Net actuarial loss for the period
  
(627
)
  
(213
)
  
(414
)
Amortization of actuarial loss from prior period
  
390
   
133
   
257
 
Net change
  
(237
)
  
(80
)
  
(157
)
             
Total change in accumulated other comprehensive loss
 
$
4,139
  
$
1,408
  
$
2,731
 
Computation of Earnings Per Share
Earnings per common share has been computed based on the following:

 
Years Ended December 31,
 
 
2016
  
2015
 
 
(dollars in thousands)
 
Net income (in thousands)
 
$
3,797
  
$
3,634
 
 
        
Average number of common shares outstanding
  
4,959,173
   
4,959,009
 
Effect of dilutive options
  
1,761
   
0
 
Average number of common shares outstanding used to calculate diluted earnings per common share
  
4,960,934
   
4,959,009