Summary of Significant Accounting Policies - Allowance for Credit Losses on Loans (Details) - USD ($) |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] | ||
| Accrued interest related to financial assets held at amortized cost | $ 16,379,000,000 | $ 14,940,000 |
| Financial Asset, Amortized Cost, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable and other assets | Accrued interest receivable and other assets |
| Bay View Funding | ||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] | ||
| Loans, net of deferred fees | $ 118,503,000,000 | $ 68,897,000 |