v3.25.2
Supplemental Information about Changes to Accumulated Other Comprehensive Income - Schedule of Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Unrealized investment (gains) losses on available for sale assets:        
Realized (gains) losses $ 18,574 $ 12,589 $ 18,489 $ 24,388
Amortization of (discount) premium (282,169) (285,636) (562,783) (568,214)
Other operating expense 108,293 99,108 217,039 192,322
Total before tax (313,299) (322,323) (629,380) (637,246)
Tax 60,550 63,968 122,068 124,674
Total after-tax (252,749) (258,355) (507,312) (512,572)
Reclassification out of Accumulated Other Comprehensive Income        
Unrealized investment (gains) losses on available for sale assets:        
Total after-tax 8,423 5,942 5,837 4,128
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 12,837 10,217 12,009 9,989
Amortization of (discount) premium (2,234) (2,817) (4,747) (5,001)
Total before tax 10,603 7,400 7,262 4,988
Tax (2,227) (1,554) (1,525) (1,047)
Total after-tax 8,376 5,846 5,737 3,941
Reclassification out of Accumulated Other Comprehensive Income | Pension adjustments:        
Unrealized investment (gains) losses on available for sale assets:        
Total before tax 59 118 127 236
Tax (12) (22) (27) (49)
Total after-tax 47 96 100 187
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost        
Unrealized investment (gains) losses on available for sale assets:        
Other operating expense 292 269 584 538
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial (gain) loss        
Unrealized investment (gains) losses on available for sale assets:        
Other operating expense $ (233) $ (151) $ (457) $ (302)