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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of the change in the components of the accumulated other comprehensive loss
(in thousands)
   
Unrealized 
Loss on 
Securities (1)
   
Unrecognized 
Net 
Pension and 
Postretirement 
Costs (2)
   
Accumulated 
Other 
Comprehensive 
(Loss) 
Income
 
Balance, December 31, 2015
      $    (591)         $    (1,427)         $    (2,018)    
Other comprehensive (loss) income, before reclassifications         (1,566)           79           (1,487)    
Amounts reclassified from accumulated other comprehensive loss         (602)           (786)           (1,388)    
Other comprehensive loss, before tax         (2,168)           (707)           (2,875)    
Income tax benefit         823           269           1,092    
Other comprehensive loss, net of tax         (1,345)           (438)           (1,783)    
Balance, December 31, 2016
      $ (1,936)         $ (1,865)         $ (3,801)    
Other comprehensive (loss) income, before reclassifications         (37)           90           53    
Amounts reclassified from accumulated other comprehensive loss         (5)           (1,085)           (1,090)    
Other comprehensive loss, before tax         (42)           (995)           (1,037)    
Income tax benefit         16           378           394    
Other comprehensive loss, net of tax
        (26)           (617)           (643)    
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 (3)
        (538)           (680)           (1,218)    
Balance, December 31, 2017
      $ (2,500)         $ (3,162)         $ (5,662)    
 
(1)     The pre-tax amounts reclassified from accumulated other comprehensive loss are included in gain on sale of investment securities in the consolidated statements of income.
 
(2)     The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost. See Note 11.
 
(3)     As of December 31, 2017, the Company elected to early adopt and retrospectively apply the reclassification of stranded income tax effects from accumulated other comprehensive loss to retained earnings, as permitted under ASU 2018-02.