Basis of Presentation and Summary of Significant Accounting Policies - Changes in the Balance of Each Component of Accumulated Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Changes in the balance of each component of accumulated other comprehensive earnings (loss)
Shareholders' Equity Attributable to Parent, Beginning Balance	$ 1,521,967	$ 1,413,514
Other comprehensive earnings (loss)	30,030	(12,671)
Shareholders' Equity Attributable to Parent, Ending Balance	1,604,212	1,520,752
Balance of securities for which an allowance for credit losses has been recognized in net earnings	1,692	904
Unrealized Gains and Losses on Available-for-Sale Securities
Changes in the balance of each component of accumulated other comprehensive earnings (loss)
Shareholders' Equity Attributable to Parent, Beginning Balance	(173,723)	(166,303)
Other comprehensive earnings before reclassifications	29,899	(13,275)
Amounts reclassified from accumulated other comprehensive earnings	131	604
Other comprehensive earnings (loss)	30,030	(12,671)
Shareholders' Equity Attributable to Parent, Ending Balance	$ (143,693)	$ (178,974)