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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Gross        
Net income (loss) $ 145,711 $ 116,487 $ 393,502 $ 138,955
Other comprehensive income (loss) 80,161 228,919 214,594 203,957
Comprehensive income (loss) 225,872 345,406 608,096 342,912
Tax        
Net income (loss) 30,371 24,209 82,323 27,478
Other comprehensive income (loss) 16,835 48,073 45,065 42,831
Comprehensive income (loss) 47,206 72,282 127,388 70,309
Net        
Net income (loss) 115,340 92,278 311,179 111,477
OCI before reclassifications     169,415  
Reclassifications     114  
Other comprehensive income (loss) 63,326 180,846 169,529 161,126
Comprehensive income (loss) 178,666 273,124 480,708 272,603
Investments Subtotal        
Gross        
Other comprehensive income (loss) 79,289 227,952 211,977 201,056
Tax        
Other comprehensive income (loss) 16,653 47,870 44,516 42,222
Net        
OCI before reclassifications     169,415  
Reclassifications     (1,954)  
Other comprehensive income (loss) 62,636 180,082 167,461 158,834
Net realized (gains) losses on disposals and intent-to-sell AFS securities        
Gross        
OCI before reclassifications 67,404 187,465 178,528 163,558
Reclassifications 580 (1,249) (128) (1,284)
Tax        
OCI before reclassifications 14,156 39,367 37,491 34,347
Reclassifications 122 (263) (27) (270)
Net        
OCI before reclassifications 53,248 148,098 141,037 129,211
Reclassifications 458 (986) (101) (1,014)
Other comprehensive income (loss)     140,936  
Credit loss related        
Gross        
OCI before reclassifications 12,134 43,927 35,922 37,090
Reclassifications (829) (2,191) (2,345) 1,692
Tax        
OCI before reclassifications 2,549 9,225 7,544 7,789
Reclassifications (174) (459) (492) 356
Net        
OCI before reclassifications 9,585 34,702 28,378 29,301
Reclassifications (655) (1,732) (1,853) 1,336
Other comprehensive income (loss)     26,525  
Defined benefit pension and post-retirement life plans        
Gross        
Other comprehensive income (loss) 872 967 2,617 2,901
Tax        
Other comprehensive income (loss) 182 203 549 609
Net        
OCI before reclassifications     0  
Reclassifications     2,068  
Other comprehensive income (loss) 690 764 2,068 2,292
Net actuarial (gain) loss        
Gross        
Reclassifications 872 967 2,617 2,901
Tax        
Reclassifications 182 203 549 609
Net        
Reclassifications $ 690 $ 764 $ 2,068 $ 2,292