v3.26.1
Supplemental Information about Changes to Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Unrealized investment (gains) losses on available for sale assets:    
Realized (gains) losses $ 1,478 $ (85)
Amortization of (discount) premium (289,824) (280,614)
Other operating expense 113,735 108,746
Total before tax (334,132) (316,081)
Tax 63,606 61,518
Total after-tax (270,526) (254,563)
Reclassification out of Accumulated Other Comprehensive Income    
Unrealized investment (gains) losses on available for sale assets:    
Total after-tax 7 (2,586)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized investment (gains) losses on available for sale assets:    
Unrealized investment (gains) losses on available for sale assets:    
Realized (gains) losses 717 (828)
Amortization of (discount) premium (2,286) (2,513)
Total before tax (1,569) (3,341)
Tax 329 702
Total after-tax (1,240) (2,639)
Reclassification out of Accumulated Other Comprehensive Income | Pension adjustments:    
Unrealized investment (gains) losses on available for sale assets:    
Total before tax 1,580 68
Tax (333) (15)
Total after-tax 1,247 53
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost    
Unrealized investment (gains) losses on available for sale assets:    
Other operating expense 252 292
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial (gain) loss    
Unrealized investment (gains) losses on available for sale assets:    
Other operating expense $ 1,328 $ (224)