Basis of Presentation and Summary of Significant Accounting Policies (Useful Lives of Premises and Equipment) (Detail) |
Mar. 31, 2026 |
|---|---|
| Minimum | Buildings | |
| Disclosure of Basis of Presentation and Summary of Significant Accounting Policies [Line Items] | |
| Years | 3 years |
| Minimum | Equipment and furniture | |
| Disclosure of Basis of Presentation and Summary of Significant Accounting Policies [Line Items] | |
| Years | 2 years |
| Maximum | Buildings | |
| Disclosure of Basis of Presentation and Summary of Significant Accounting Policies [Line Items] | |
| Years | 50 years |
| Maximum | Equipment and furniture | |
| Disclosure of Basis of Presentation and Summary of Significant Accounting Policies [Line Items] | |
| Years | 20 years |