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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity [Abstract]  
Components of Accumulated Other Comprehensive (Loss) Income
In accordance with GAAP, unrecognized prior service costs and net actuarial gains or losses associated with the Company’s pension and postretirement benefit plans and unrealized gains on derivatives and on AFS securities are included in AOCI, net of tax. For the years ended December 31, components of AOCI are:

(In thousands)
  
2020
    
2019
    
2018
  
Unrecognized prior service cost and net actuarial (losses) on pension plans
  
$
(20,134
)
  
$
(21,677
)
  
$
(27,689
)
Unrealized (losses) gains on derivatives (cash flow hedges)
    
(16
)
    
(32
)
    
1,821
  
Unrealized net holding gains (losses) on AFS securities
    
20,567
      
2,683
      
(17,306
)
AOCI
  
$
417
    
$
(19,026
)
  
$
(43,174
)