Investment Securities - Allowance for credit losses of available for sale securities by major security type (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] | ||||
| Beginning Balance | $ 34,000 | $ 1,000,000 | $ 0 | $ 360,000 |
| Provision (Recovery) | (4,000) | 0 | 30,000 | 640,000 |
| Ending Balance | 30,000 | 1,000,000 | 30,000 | 1,000,000 |
| Corporate bonds | ||||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] | ||||
| Beginning Balance | 34,000 | 1,000,000 | 360,000 | |
| Provision (Recovery) | (4,000) | 0 | 30,000 | 640,000 |
| Ending Balance | $ 30,000 | $ 1,000,000 | $ 30,000 | $ 1,000,000 |