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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Income and Comprehensive Income      
Net income $ 541,342 $ 1,102,641 $ 934,889
Other comprehensive income (loss) before tax:      
Foreign currency translation adjustment (7,793) 10,572 3,947
Adjustment of pension and postretirement benefit plans 23,052 7,811 36,950
Amortization of net losses 19,253 15,644 20,749
Unrealized net holding gains (losses) on debt securities arising during the period 391,633 (2,539,421) (619,470)
Reclassification adjustment for gains included in net income 0 0 (23)
Amortization of unrealized losses of debt securities transfer from available-for-sale to held-to-maturity 172,883 41,642 0
Unrealized net gains (losses) on cash flow hedges (30) 3,719 539
Reclassification adjustment for net (gains) losses included in net income (41) (960) 1,847
Other comprehensive income (loss) before tax 598,957 (2,460,993) (555,461)
Income tax benefit 30,440 261,134 40,401
Total other comprehensive income (loss), net of tax 629,397 (2,199,859) (515,060)
Comprehensive income (loss), net of tax $ 1,170,739 $ (1,097,218) $ 419,829