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Derivative Instruments and Hedging Activities - Additional Information (Details)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 06, 2021
USD ($)
Oct. 31, 2021
USD ($)
Nov. 30, 2021
USD ($)
member
May 31, 2021
USD ($)
Jul. 20, 2021
USD ($)
agreement
Derivative [Line Items]          
Treasury rate lock, number of agreements | agreement         2
Derivative asset, notional amount     $ 2,816,570 $ 2,560,618  
Number of counterparties subject to ratings trigger and early termination provision | member     1    
Farmer Mac notes payable          
Derivative [Line Items]          
Proceeds from notes payable   $ 250,000      
Interest rate contracts and treasury lock          
Derivative [Line Items]          
Derivative, notional amount     $ 223,000    
Unrealized loss position     28,000    
Interest rate swaps and treasury lock          
Derivative [Line Items]          
Net liability position     $ 400,000    
Interest rate swaps and treasury lock | Derivative | Counterparty exposure risk          
Derivative [Line Items]          
Concentration risk, percentage     24.00% 24.00%  
Treasury rate lock—cash flow hedge | Cash Flow Hedging          
Derivative [Line Items]          
Derivative asset, notional amount         $ 250,000
Unrealized gains on cash flow hedge $ 5,000        
AOCI, cash flow hedge, cumulative gain $ 4,000