Investment and Equity Securities - Unrealized Gain and Losses related to Equity Securities (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Gross proceeds from sales | $ 270 | $ 270 | ||
| Net gains (losses) recognized during the period on equity securities | (3) | $ 14 | 18 | $ (9) |
| Less: Net gains (losses) recognized from equity securities sold during the period | (6) | (6) | ||
| Unrealized gains (losses) recognized during the period on equity securities still held at the reporting date | $ 3 | $ 14 | $ 24 | $ (9) |