v3.26.1
FAIR VALUE DISCLOSURES - Schedule of Unobservable Input Reconciliation (Details) - Level 3 - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 6,744,017 $ 5,539,404
Purchases 395,000 300,000
Settlements (213,339) (276,114)
Allowance for Losses (8) 50
Realized and unrealized (losses)/gains included in Income $ (21,460) 82,067
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Realized andunrealized (losses)/gains included in Income  
Unrealized (losses)/gains included in other comprehensive income $ (17,845) $ 2,627
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Net unrealized (losses)/gains on available-for-sale securities Net unrealized (losses)/gains on available-for-sale securities
Ending Balance $ 6,886,365 $ 5,648,034
Available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 6,739,120 5,534,022
Purchases 395,000 300,000
Settlements (213,256) (276,028)
Allowance for Losses (8) 50
Realized and unrealized (losses)/gains included in Income (21,513) 82,066
Unrealized (losses)/gains included in other comprehensive income (17,845) 2,627
Ending Balance 6,881,498 5,642,737
ABS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 0  
Purchases 45,000  
Settlements 0  
Allowance for Losses 0  
Realized and unrealized (losses)/gains included in Income (18)  
Unrealized (losses)/gains included in other comprehensive income (396)  
Ending Balance 44,586  
Auction-rate certificates backed by Government guaranteed student loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   19,476
Purchases   0
Settlements   0
Allowance for Losses   0
Realized and unrealized (losses)/gains included in Income   0
Unrealized (losses)/gains included in other comprehensive income   (123)
Ending Balance   19,353
AgVantage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 6,730,917 5,505,531
Purchases 350,000 300,000
Settlements (213,096) (275,854)
Allowance for Losses (8) 50
Realized and unrealized (losses)/gains included in Income (21,495) 82,066
Unrealized (losses)/gains included in other comprehensive income (17,559) 2,719
Ending Balance 6,828,759 5,614,512
Interest-Only Farmer Mac Guaranteed Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 8,203 9,015
Purchases 0 0
Settlements (160) (174)
Allowance for Losses 0 0
Realized and unrealized (losses)/gains included in Income 0 0
Unrealized (losses)/gains included in other comprehensive income 110 31
Ending Balance 8,153 8,872
Other Assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 4,897 5,382
Purchases 0 0
Settlements (83) (86)
Allowance for Losses 0 0
Realized and unrealized (losses)/gains included in Income 53 1
Unrealized (losses)/gains included in other comprehensive income 0 0
Ending Balance $ 4,867 $ 5,297