v3.26.1
Related Party Transactions - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]          
Notional Amount of Derivatives $ 178,444,793,000   $ 178,444,793,000   $ 198,855,637,000
Compensating balances 30,000,000.0   30,000,000.0   5,000,000.0
Related Party          
Related Party Transaction [Line Items]          
Mortgage-backed securities acquired     0 $ 0  
Notional Amount of Derivatives 0   0   0
Overnight loans extended to other FHLBanks 14,900,000   $ 14,900,000   8,400,000
Borrowing period from other FHLBanks     1 day    
Borrowings from other FHLBanks 0   $ 0   0
Annual lease receipt 100,000   100,000    
Related Party | Citibank, N.A.          
Related Party Transaction [Line Items]          
Compensating balances 30,000,000.0   30,000,000.0   5,000,000.0
Debt Assumptions | Related Party          
Related Party Transaction [Line Items]          
Amount of transaction     0 0  
Debt Transfers | Related Party          
Related Party Transaction [Line Items]          
Amount of transaction       0  
Debt Transfers | Related Party | Hedged consolidated obligation bonds          
Related Party Transaction [Line Items]          
Amount of transaction 750,000,000        
Debt Transfers | Related Party | Hedged consolidated obligation discount notes          
Related Party Transaction [Line Items]          
Amount of transaction 1,000,000,000.0        
Advances Sold or Transferred | Related Party          
Related Party Transaction [Line Items]          
Amount of transaction     0 0  
Mortgage Partnership Finance Program Services | Related Party | Federal Home Loan Bank of Chicago          
Related Party Transaction [Line Items]          
Amount of transaction 200,000 $ 300,000 500,000 $ 500,000  
Purchases of mortgage loans, cumulative participations by other Federal Home Loan Banks $ 1,800,000   $ 1,800,000   $ 2,000,000.0