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Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Unrealized gains (losses) on investment securities:    
Net income (loss) $ 138,886 $ 102,566
Unrealized holding gains (losses) during the period 69,260 (15,560)
Unrealized gains (losses) on securities with credit loss recognized in earnings 12,766 (3,132)
Amounts reclassified into net income (loss):    
Net realized (gains) losses on disposals and intent-to-sell AFS securities (274) (78)
Credit loss (benefit) expense (629) 2,650
Total unrealized gains (losses) on investment securities 81,123 (16,120)
Defined benefit pension and post-retirement plans:    
Net actuarial (gain) loss 872 967
Total defined benefit pension and post-retirement plans 872 967
Other comprehensive income (loss) 81,995 (15,153)
Comprehensive income (loss) 220,881 87,413
Tax    
Net income (loss) 28,990 20,048
Unrealized gains (losses) on investment securities:    
Unrealized holding gains (losses) during the period 14,545 (3,267)
Unrealized gains (losses) on securities with credit loss recognized in earnings 2,680 (658)
Amounts reclassified into net income (loss):    
Net realized (gains) losses on disposals and intent-to-sell AFS securities (58) (17)
Credit loss (benefit) expense (132) 557
Total unrealized gains (losses) on investment securities 17,035 (3,385)
Defined benefit pension and post-retirement plans:    
Net actuarial (gain) loss 183 203
Total defined benefit pension and post-retirement plans 183 203
Other comprehensive income (loss) 17,218 (3,182)
Comprehensive income (loss) 46,208 16,866
Net    
Net income (loss) 109,896 82,518
Unrealized gains (losses) on investment securities:    
Unrealized holding gains (losses) during the period 54,715 (12,293)
Unrealized gains (losses) on securities with credit loss recognized in earnings 10,086 (2,474)
Amounts reclassified into net income (loss):    
Net realized (gains) losses on disposals and intent-to-sell AFS securities (216) (61)
Credit loss (benefit) expense (497) 2,093
Total unrealized gains (losses) on investment securities 64,088 (12,735)
Defined benefit pension and post-retirement plans:    
Net actuarial (gain) loss 689 764
Total defined benefit pension and post-retirement plans 689 764
Other comprehensive income (loss) 64,777 (11,971)
Comprehensive income (loss) $ 174,673 $ 70,547