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Accumulated Other Comprehensive Income
 9 Months Ended
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income 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 and losses 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 and losses on cash flow hedge derivatives is located in Note 11.

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 Further, the new standard superceded the guidance related to other-than-temporary impairment (OTTI), including the requirement to separately disclose the unrealized gains and losses on securities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 first nine months of 2020, there were no securities for which an allowance for credit losses was recorded.

Unrealized Gains (Losses) on Securities (1)Pension Loss Unrealized Gains (Losses) 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 $110,444 
Adoption of ASU 2016-13(3,264)3,264 — — — 
Balance January 1, 2020, adjusted— 102,073 (21,940)30,311 110,444 
Other comprehensive income before reclassifications to current earnings— 237,583 — 94,702 332,285 
Amounts reclassified to current earnings from accumulated other comprehensive income — (16,965)1,384 (6,050)(21,631)
 Current period other comprehensive income, before tax— 220,618 1,384 88,652 310,654 
Income tax expense— (55,154)(346)(22,163)(77,663)
 Current period other comprehensive income, net of tax— 165,464 1,038 66,489 232,991 
Balance September 30, 2020$— $267,537 $(20,902)$96,800 $343,435 
Balance January 1, 2019$3,861 $(52,278)$(23,107)$6,855 $(64,669)
Other comprehensive income (loss) before reclassifications to current earnings(709)229,288 — 46,165 274,744 
Amounts reclassified to current earnings from accumulated other comprehensive income133 (728)1,554 2,751 3,710 
 Current period other comprehensive income (loss), before tax(576)228,560 1,554 48,916 278,454 
Income tax (expense) benefit144 (57,139)(388)(12,229)(69,612)
 Current period other comprehensive income (loss), net of tax(432)171,421 1,166 36,687 208,842 
Transfer of unrealized gain on securities for which impairment was not previously recognized35 (35)— — — 
Balance September 30, 2019$3,464 $119,108 $(21,941)$43,542 $144,173 
(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.