Investment Securities Investment Securities (Trading Securities by Major Security Type) (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Trading securities | $ 153,520 | $ 439,963 |
| GSE Debenture [Member] | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Trading securities | 0 | 17,884 |
| Non-mortgage-backed securities [Member] | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Trading securities | 0 | 17,884 |
| GSE MBS [Member] | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Trading securities | 153,520 | 422,079 |
| Mortgage-backed securities [Member] | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Trading securities | $ 153,520 | $ 422,079 |