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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income
The table below shows the activity and accumulated balances for components of other comprehensive income. The largest component is the unrealized holding gains and losses on available for sale debt securities. Another component is the amortization from other comprehensive income of losses associated with pension benefits, which occurs as the losses are included in current net periodic pension cost. The remaining component is gains in fair value on certain interest rate floors that have been designated as cash flow hedging instruments. Information about unrealized gains and losses on securities can be found in Note 3, and information about unrealized gains on cash flow hedge derivatives is located in Note 19.

The Company adopted ASU 2016-13 (CECL) on January 1, 2020, which changed the impairment model for available for sale debt securities. The new standard requires an allowance for credit losses when the present value of the cash flows expected to be collected is less than the security's amortized cost basis. See further discussion of the Company's CECL adoption in Note 1 and Note 3 to the consolidated financial statements. Further, the new standard superseded the guidance related to other-than-temporary impairment (OTTI), including the requirement to separately disclose the unrealized gains and losses on securities with OTTI. Prior to the Company's adoption of CECL, unrealized gains and losses on debt securities for which an OTTI has been recorded in current earnings were shown separately below. As a result of adopting CECL, the table below will separately disclose unrealized gains and losses on debt securities for which an allowance for credit losses has been recorded. During the year ended December 31, 2020, there were no securities for which an allowance for credit losses was recorded.

Unrealized Gains (Losses) on Securities (1)Pension Loss Unrealized Gains on Cash Flow Hedge Derivatives (2)Total Accumulated Other Comprehensive Income (Loss)
(In thousands)OTTIOther
Balance January 1, 2020$3,264 $98,809 $(21,940)$30,311 $110,444 
Adoption of ASU 2016-13(3,264)3,264 — — — 
Balance January 1, 2020, adjusted$— $102,073 $(21,940)$30,311 $110,444 
Other comprehensive income (loss) before reclassifications— 236,733 (6,104)93,497 324,126 
Amounts reclassified from accumulated other comprehensive income— (21,096)1,867 (10,319)(29,548)
Current period other comprehensive income (loss), before tax
— 215,637 (4,237)83,178 294,578 
Income tax (expense) benefit— (53,909)1,059 (20,795)(73,645)
Current period other comprehensive income (loss), net of tax
— 161,728 (3,178)62,383 220,933 
Balance December 31, 2020$— $263,801 $(25,118)$92,694 $331,377 
Balance January 1, 2019$3,861 $(52,278)$(23,107)$6,855 $(64,669)
Other comprehensive income (loss) before reclassifications(975)201,280 (461)27,481 227,325 
Amounts reclassified from accumulated other comprehensive income133 215 2,017 3,793 6,158 
Current period other comprehensive income (loss), before tax
(842)201,495 1,556 31,274 233,483 
Income tax (expense) benefit210 (50,373)(389)(7,818)(58,370)
Current period other comprehensive income (loss), net of tax
(632)151,122 1,167 23,456 175,113 
Transfer of unrealized gain on securities for which impairment was not previously recognized
35 (35)— — — 
Balance December 31, 2019$3,264 $98,809 $(21,940)$30,311 $110,444 
(1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.
(2) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.