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Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Other Comprehensive Income (Loss) Other Comprehensive Income (Loss)
(In Thousands)
Changes in the components of other comprehensive income, net of tax, were as follows for the periods presented:
 
Pre-TaxTax Expense
(Benefit)		Net of Tax
Three months ended March 31, 2021
Securities available for sale:
Unrealized holding losses on securities$(20,044)$(5,101)$(14,943)
Reclassification adjustment for gains realized in net income(1,357)(345)(1,012)
Total securities available for sale(21,401)(5,446)(15,955)
Derivative instruments:
Unrealized holding gains on derivative instruments14,734 3,750 10,984 
Total derivative instruments14,734 3,750 10,984 
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost54 12 42 
Total defined benefit pension and post-retirement benefit plans54 12 42 
Total other comprehensive loss$(6,613)$(1,684)$(4,929)
Three months ended March 31, 2020
Securities available for sale:
Unrealized holding gains on securities$22,389 $5,695 $16,694 
Total securities available for sale22,389 5,695 16,694 
Derivative instruments:
Unrealized holding losses on derivative instruments(4,028)(1,025)(3,003)
Total derivative instruments(4,028)(1,025)(3,003)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost62 16 46 
Total defined benefit pension and post-retirement benefit plans62 16 46 
Total other comprehensive income$18,423 $4,686 $13,737 

The accumulated balances for each component of other comprehensive income, net of tax, were as follows as of the dates presented:
 
March 31,
2021		December 31, 2020
Unrealized gains on securities$14,972 $42,246 
Non-credit related portion of previously recorded other-than-temporary impairment on securities— (11,319)
Unrealized gains (losses) on derivative instruments10,346 (638)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations(5,179)(5,221)
Total accumulated other comprehensive income$20,139 $25,068