Investments - Net Gains (Losses) on Trading Securities (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Debt Securities, Trading, Gain (Loss) [Abstract] | ||||
| Net gains (losses) on trading securities held at period end | $ 2,332 | $ 3,203 | $ 9,253 | $ (1,837) |
| Net gains on trading securities that matured/sold during the period | 0 | 0 | 0 | 469 |
| Debt Securities, Trading, Gain (Loss), Total | $ 2,332 | $ 3,203 | $ 9,253 | $ (1,368) |