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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 207,012 $ 365,238 $ 224,886
Unrealized gains (losses) on investment securities:      
Unrealized holding gains (losses) arising during year 18,075 84,407 (527,805)
Unrealized gains (losses) on securities with credit loss recognized in earnings 7,790 47,585 (148,495)
Amounts reclassified into net income:      
Held-to-maturity securities 0 0 3
Net realized (gains) losses on disposals and intent-to-sell available-for-sale securities (1,504) 16,162 47,438
Credit loss (benefit) expense 4,446 (10,189) 30,944
Total unrealized gains (losses) on investment securities 28,807 137,965 (597,915)
Defined benefit pension and post-retirement plans:      
Net actuarial gain (loss) 4,293 (15,315) (16,543)
Amounts reclassified into net income:      
Net actuarial loss 3,056 2,391 1,317
Total defined benefit pension and post-retirement plans 7,349 (12,924) (15,226)
Other comprehensive income (loss) 36,156 125,041 (613,141)
Comprehensive income (loss) $ 243,168 $ 490,279 $ (388,255)