v3.26.1
Derivatives and Hedging Activities - Schedule of Notional Balances and Estimated Fair Values of the Derivatives Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Derivative [Line Items]    
Notional Amount of Derivatives $ 178,444,793 $ 198,855,637
Derivative Assets    
Total derivatives not designated as hedging instruments 1,694,917 1,731,523
Netting adjustments (1,576,815) (1,610,805)
Cash collateral and related accrued interest (26,230) (21,170)
Total netting adjustments and cash collateral (1,603,045) (1,631,975)
Total derivative assets and total derivative liabilities 91,872 99,548
Security collateral pledged as initial margin to Derivative Clearing Organization 843,961 845,578
Security collateral received from counterparty (48,793) (55,831)
Total net amount of non-cash collateral received or repledged 795,168 789,747
Net exposure 887,040 889,295
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,642,996 1,760,052
Netting adjustments (1,576,815) (1,610,805)
Cash collateral and related accrued interest (58,960) (145,150)
Total netting adjustments and cash collateral (1,635,775) (1,755,955)
Total derivative assets and total derivative liabilities 7,221 4,097
Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 150,986,261 168,284,750
Derivative Assets    
Total derivatives not designated as hedging instruments 1,241,860 1,390,505
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,254,510 1,440,349
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 27,458,532 30,570,887
Derivative Assets    
Total derivatives not designated as hedging instruments 453,057 341,018
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 388,486 319,703
Interest rate swaps    
Derivative [Line Items]    
Notional Amount of Derivatives 176,614,420 197,819,179
Interest rate swaps | Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 150,986,261 168,284,750
Derivative Assets    
Total derivatives not designated as hedging instruments 1,241,860 1,390,505
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 1,254,510 1,440,349
Interest rate swaps | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 25,628,159 29,534,429
Derivative Assets    
Total derivatives not designated as hedging instruments 449,950 339,938
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 388,444 319,695
Interest rate caps    
Derivative [Line Items]    
Notional Amount of Derivatives 1,750,000 1,000,000
Interest rate caps | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 1,750,000 1,000,000
Derivative Assets    
Total derivatives not designated as hedging instruments 2,975 999
Derivative Liabilities    
Total derivatives before netting and collateral adjustments 0 0
Mortgage delivery commitments    
Derivative [Line Items]    
Notional Amount of Derivatives 80,373 36,458
Mortgage delivery commitments | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount of Derivatives 80,373 36,458
Derivative Assets    
Total derivatives not designated as hedging instruments 132 81
Derivative Liabilities    
Total derivatives before netting and collateral adjustments $ 42 $ 8