Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Apr. 01, 2026	Jun. 30, 2026	Dec. 31, 2025
Business Combination [Line Items]
Goodwill	$ 42,100	$ 1,147,081	$ 1,104,992
American National [Member]
Business Combination [Line Items]
Business Combination, Consideration Transferred	594,144
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	220,898
Business Combination, Recognized Asset Acquired, Investment in Debt and Equity Securities, Current	989,925
Business Combination, Recognized Asset Acquired, Receivable, Current	3,716,472
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived	103,200
Business Combination, Recognized Asset Acquired, Other Asset, Current	155,960
Business Combination, Recognized Asset Acquired, Asset, Current	5,186,455
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Deposits	4,544,700
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent	89,700
Business Combination, Recognized Liability Assumed, Liability	4,634,400
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)	552,055
Goodwill	$ 42,089