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Consolidation Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income $ 365,238 $ 224,886 $ 403,837
Unrealized holding gains (losses) arising during year 84,407 (527,805) (119,598)
Unrealized gains (losses) on securities with credit loss recognized in earnings 47,585 (148,495) (7,159)
Amounts reclassified into net income: Held-to-maturity securities 0 3 (9)
Amounts reclassified into net income: Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities 16,162 47,438 (3,022)
Amounts reclassified into net income: Credit loss (benefit) expense (10,189) 30,944 5,418
Total unrealized gains (losses) on investment securities 137,965 (597,915) (124,370)
Net actuarial gain (loss) (15,315) (16,543) 17,093
Amount reclassified into net income: Net actuarial (gain) loss, Net 2,391 1,317 2,190
Total defined benefit pension and post-retirement plans (12,924) (15,226) 19,283
Other comprehensive income (loss) 125,041 (613,141) (105,087)
Comprehensive income (loss) $ 490,279 $ (388,255) $ 298,750