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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net realized and unrealized investment gains (losses) $ (5,426) $ (42,880) $ (2,082) $ (83,232)
Net investment income earned 97,696 70,222 189,202 142,824
Loss and loss expense incurred 646,130 524,868 1,213,568 1,019,104
Other insurance expenses 108,857 101,514 217,445 195,504
Income before federal income tax 74,157 49,904 188,916 119,794
Total federal income tax expense (15,549) (10,384) (37,734) (23,944)
Net income (loss) 58,608 39,520 151,182 95,850
Reclassification out of AOCI        
Net income (loss) 7,328 26,945 5,221 57,329
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 173 84 348 180
Other insurance expenses 584 333 1,166 654
Income before federal income tax 757 417 1,514 834
Total federal income tax expense (159) (87) (318) (175)
Net income (loss) 598 330 1,196 659
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 0 0 0 0
Net investment income earned 0 0 0 1
Income before federal income tax 0 0 0 1
Total federal income tax expense 0 0 0 0
Net income (loss) 0 0 0 1
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) 9,383 18,170 15,487 34,161
Income before federal income tax 9,383 18,170 15,487 34,161
Total federal income tax expense (1,970) (3,816) (3,252) (7,174)
Net income (loss) 7,413 14,354 12,235 26,987
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment gains (losses) (864) 15,519 (10,393) 37,571
Income before federal income tax (864) 15,519 (10,393) 37,571
Total federal income tax expense 181 (3,258) 2,183 (7,889)
Net income (loss) $ (683) $ 12,261 $ (8,210) $ 29,682