v3.26.3
Derivatives and Hedging Activities - Schedule of Notional Balances and Estimated Fair Values of the Derivatives Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Notional Amount of Derivatives $ 181,220,832 $ 198,855,637
Derivative Assets    
Total derivatives not designated as hedging instruments 1,342,151 1,731,523
Netting adjustments (1,274,469) (1,610,805)
Cash collateral and related accrued interest (15,370) (21,170)
Total netting adjustments and cash collateral (1,289,839) (1,631,975)
Total derivative assets and total derivative liabilities 52,312 99,548
Security collateral pledged as initial margin to Derivative Clearing Organization 839,285 845,578
Security collateral received from counterparty (25,953) (55,831)
Total net amount of non-cash collateral received or repledged 813,332 789,747
Net exposure 865,644 889,295
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,404,238 1,760,052
Netting adjustments (1,274,469) (1,610,805)
Cash collateral and related accrued interest (125,570) (145,150)
Total netting adjustments and cash collateral (1,400,039) (1,755,955)
Total derivative assets and total derivative liabilities 4,199 4,097
Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 153,597,700 168,284,750
Derivative Assets    
Total derivatives not designated as hedging instruments 1,037,579 1,390,505
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,184,094 1,440,349
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 27,623,132 30,570,887
Derivative Assets    
Total derivatives not designated as hedging instruments 304,572 341,018
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 220,144 319,703
Interest rate swaps    
Derivative [Line Items]    
Notional Amount of Derivatives 176,452,016 197,819,179
Interest rate swaps | Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 153,597,700 168,284,750
Derivative Assets    
Total derivatives not designated as hedging instruments 1,037,579 1,390,505
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,184,094 1,440,349
Interest rate swaps | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 22,854,316 29,534,429
Derivative Assets    
Total derivatives not designated as hedging instruments 297,932 339,938
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 218,092 319,695
Interest rate caps    
Derivative [Line Items]    
Notional Amount of Derivatives 4,710,000 1,000,000
Interest rate caps | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 4,710,000 1,000,000
Derivative Assets    
Total derivatives not designated as hedging instruments 6,622 999
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 0 0
Mortgage delivery commitments    
Derivative [Line Items]    
Notional Amount of Derivatives 58,816 36,458
Mortgage delivery commitments | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 58,816 36,458
Derivative Assets    
Total derivatives not designated as hedging instruments 18 81
Derivative Liabilities    
Total derivatives before netting and collateral adjustments $ 2,052 $ 8