Commitments and Contingent Liabilities - Securities Lent with Indemnification Narrative (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability	$ 349,426,200,000	$ 285,453,400,000
Indemnification Agreement
Loss Contingencies [Line Items]
Credit loss liability	0	0
Financial Guarantee
Loss Contingencies [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability	$ 170,738,800,000	$ 144,543,700,000