Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Guarantees [Abstract] | ||
| Total of Loans Covered by Guarantees | $ 790.7 | $ 687.6 |
| Total of Guaranteed Loans Inquired About | 5.1 | 3.6 |
| Loan Repurchase Guarantee Liability | $ 1.4 | $ 1.0 |