v3.26.1
Basis of Presentation and Summary of Significant Accounting Policies - Effects of Reclassifications out of Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Abstract]            
Earnings before income taxes $ 210,688   $ 156,515   $ 278,029 $ 235,146
Income tax (expense) benefit (42,660)   (32,179)   (55,116) (47,596)
Net earnings 168,028 $ 54,885 124,336 $ 63,214 222,913 187,550
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Abstract]            
Net realized gains (losses) (507)   (898)   (1,570) (1,103)
Credit gains (losses) presented within net realized gains 75   (88)   365 (48)
Earnings before income taxes (432)   (986)   (1,205) (1,151)
Income tax (expense) benefit 91   207   253 242
Net earnings $ (341)   $ (779)   $ (952) $ (909)