Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Other Commitments [Line Items] | |||
| Outstanding loan commitments | $ 285.5 | $ 285.5 | $ 247.2 |
| Cancellable amounts | 35.7 | 35.7 | 35.2 |
| Outstanding stand-by letters of credit | 9.7 | 9.7 | 6.3 |
| Provision for credit losses for unfunded commitments | 0.6 | 0.6 | |
| Future commitments outstanding related to investments | 4.6 | 4.6 | 4.9 |
| Other Liabilities [Member] | |||
| Other Commitments [Line Items] | |||
| Reserves for unfunded commitments to borrowers | $ 1.4 | $ 1.4 | $ 0.8 |