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Unaudited Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 82,518 $ 92,574
Other comprehensive income (loss), net of tax:    
Unrealized holding gains (losses) arising during period (12,293) 52,079
Unrealized gains (losses) on securities with credit loss recognized in earnings (2,474) 17,721
Net realized (gains) losses on disposals and losses on intent-to-sell available-for-sale securities (61) 4,822
Credit loss (benefit) expense 2,093 (7,527)
Total unrealized gains (losses) on investment securities (12,735) 67,095
Net actuarial loss 764 598
Total defined benefit pension and post-retirement plans 764 598
Other comprehensive income (loss) (11,971) 67,693
Comprehensive income (loss) $ 70,547 $ 160,267