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Stockholders' Equity (Tables) | 12 Months Ended
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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 | )

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