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Comprehensive Income - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrealized gains (losses) on investment securities:      
Net income $ 258,034 $ 458,412 $ 280,186
Unrealized holding gains (losses) during the year 22,880 106,845 (668,107)
Unrealized gains (losses) on securities with credit loss recognized in earnings 9,861 60,234 (187,968)
Amounts reclassified into net income:      
HTM securities     (4)
Net realized (gains) losses on disposals and intent-to-sell AFS securities (1,903) 20,458 60,048
Credit loss (benefit) expense 5,628 (12,898) 39,169
Total unrealized gains (losses) on investment securities 36,466 174,639 (756,854)
Defined benefit pension and post-retirement plans:      
Net actuarial gain (loss) 5,434 (19,385) (20,941)
Amount reclassified into net income (loss): Net actuarial (gain) loss 3,868 3,026 1,668
Total defined benefit pension and post-retirement plans (9,302) 16,359 19,273
Other comprehensive income (loss) 45,768 158,280 (776,127)
Comprehensive income (loss) 303,802 616,692 (495,941)
Tax      
Net income 51,022 93,174 55,300
Unrealized gains (losses) on investment securities:      
Unrealized holding gains (losses) during the year 4,805 22,438 (140,302)
Unrealized gains (losses) on securities with credit loss recognized in earnings 2,071 12,649 (39,473)
Amounts reclassified into net income:      
HTM securities     1
Net realized (gains) losses on disposals and intent-to-sell AFS securities (399) 4,296 12,610
Credit loss (benefit) expense 1,182 (2,709) 8,225
Total unrealized gains (losses) on investment securities 7,659 36,674 (158,939)
Defined benefit pension and post-retirement plans:      
Net actuarial gain (loss) 1,141 (4,070) (4,398)
Amount reclassified into net income: Net actuarial (gain) loss 812 635 351
Total defined benefit pension and post-retirement plans (1,953) 3,435 4,047
Other comprehensive income (loss) 9,612 33,239 (162,986)
Comprehensive income (loss) 60,634 126,413 (107,686)
Net      
Net income 207,012 365,238 224,886
Unrealized gains (losses) on investment securities:      
Unrealized holding gains (losses) during the 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:      
HTM securities 0 0 3
Net realized (gains) losses on disposals and intent-to-sell AFS 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)
Amount reclassified into net income: Net actuarial (gain) 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)