Marketable Securities - Credit Quality of Held to Maturity Securities (Details) $ in Thousands	Jun. 30, 2026 USD ($)
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	$ 630,802
Mortgage-backed securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	522,812
Debt issued by the U.S. government-sponsored enterprises
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	107,990
AA+
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	630,802
AA+ \| Mortgage-backed securities
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	522,812
AA+ \| Debt issued by the U.S. government-sponsored enterprises
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total marketable securities held-to-maturity	$ 107,990