Mortgage Loans Held for Portfolio - By Type (Details) - Residential Portfolio Segment - USD ($) $ in Thousands |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total mortgage loans held for portfolio, UPB | $ 11,163,148 | $ 10,590,772 |
| Government-guaranteed or -insured | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total mortgage loans held for portfolio, UPB | 285,594 | 268,396 |
| Conventional | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total mortgage loans held for portfolio, UPB | $ 10,877,554 | $ 10,322,376 |