Nature of Operations and Summary of Significant Accounting Policies - Estimated Useful Lives of Premises and Equipment (Detail) |
Jun. 30, 2025 |
|---|---|
| Maximum [Member] | Buildings and Improvements [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives | 40 years |
| Maximum [Member] | Furniture and Equipment [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives | 5 years |
| Minimum [Member] | Buildings and Improvements [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives | 35 years |
| Minimum [Member] | Furniture and Equipment [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives | 3 years |