Premises and Equipment - Schedule of Right-of-use Asset and Lease Obligations by Type of Property (Detail) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Operating Lease, Right-of-Use Asset | $ 3,528 | $ 3,600 |
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets |
| Operating Leases, Lease Liability | $ 3,527 | $ 3,601 |
| Operating Leases, Weighted Average Lease Term in Years | 12 years 1 month 6 days | 12 years 6 months |
| Operating Leases, Weighted Average Discount Rate | 3.29% | 3.29% |
| Land and Building Leases [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Operating Lease, Right-of-Use Asset | $ 3,528 | $ 3,600 |
| Operating Leases, Lease Liability | $ 3,527 | $ 3,601 |
| Operating Leases, Weighted Average Lease Term in Years | 12 years 1 month 6 days | 12 years 6 months |
| Operating Leases, Weighted Average Discount Rate | 3.29% | 3.29% |