Derivative Instruments and Hedging Activities - Notional Amounts of Derivative Positions (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Derivative [Line Items] | ||||
| Average notional amount | $ (18,778,774) | $ (9,545,945) | $ (19,580,828) | $ (10,535,506) |
| Inverse interest-only securities | ||||
| Derivative [Line Items] | ||||
| Average notional amount | (725,242) | (153,200) | (446,686) | (156,846) |
| Interest rate swap agreements | ||||
| Derivative [Line Items] | ||||
| Average notional amount | (19,062,123) | (11,368,537) | (19,728,068) | (13,252,491) |
| Swaptions, net | ||||
| Derivative [Line Items] | ||||
| Average notional amount | 0 | 0 | 0 | (116,484) |
| TBAs | ||||
| Derivative [Line Items] | ||||
| Average notional amount | (2,471,752) | (4,294,758) | (2,794,246) | (3,666,253) |
| Futures, net | ||||
| Derivative [Line Items] | ||||
| Average notional amount | (3,518,726) | (6,270,550) | (3,434,363) | (6,423,600) |
| Interest rate lock commitments | ||||
| Derivative [Line Items] | ||||
| Average notional amount | (33,461) | 0 | (31,194) | 0 |
| Forward mortgage loan sale commitments | ||||
| Derivative [Line Items] | ||||
| Average notional amount | $ (4,922) | $ 0 | $ (14,997) | $ 0 |