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
	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss)
Earnings before income taxes	$ 78,631	$ 159,991
Income tax (expense) benefit	(15,417)	(32,091)
Net earnings	63,214	127,900
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss)
Net realized gains (losses) - Available-for-sale	(205)	(834)
Credit gains (losses) presented within net realized gains	40	70
Earnings before income taxes	(165)	(764)
Income tax (expense) benefit	34	160
Net earnings	$ (131)	$ (604)