Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
|
| Interest rate swaps | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | $ 14,831,307 | $ 11,501,990 |
| TBA securities | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 785,132 | 401,288 |
| Credit default swaps | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 830,492 | 1,164,093 |
| Futures | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 224,625 | 213,100 |
| Forwards | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 34,549 | 22,082 |
| Warrants | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 109 | 105 |
| Total return swaps | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | 2,857 | 428 |
| Options | ||
| Derivative [Line Items] | ||
| Average Monthly Notional | $ 5,041 | $ 6,382 |