TAX EFFECT ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Income and Comprehensive Income
Adjustment of pension and postretirement benefit plans	$ (2,929)	$ (13,856)	$ 3,387
Amortization of net losses	(5,867)	(7,781)	(8,042)
Unrealized net holding (losses) gains on debt securities arising during the period	278,324	62,468	(51,213)
Reclassification adjustment for gains included in net income	0	5	6
Amortization of unrealized losses of debt securities transfer from available-for-sale to held-to-maturity	(8,328)	0	0
Unrealized net gains (losses) on cash flow hedges	(612)	(172)	2,472
Reclassification adjustment for net (gains) losses included in net income	546	(263)	(2,084)
Income tax benefit (expense)	$ (261,134)	$ (40,401)	$ 55,474

Amount of tax expense (benefit) on adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Tax effect of plan amendments that occurred that has not been recognized in net periodic benefit cost.

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