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Assets and Liabilities Recorded at Fair Value on Recurring Basis (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities $ 3,022,174,000 $ 2,158,010,000
FHLBC Stock Excluded Because It Is Carried at Cost 2,500 3,800,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 3,022,174,000 2,158,010,000
Margin Deposit Assets 9,865,000 8,483,000
Interest Rate Swaption   669,000
Interest Rate Swaps 9,500,000  
Market Value Of To Be Announced Contracts (1,117,000)  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 0 0
Margin Deposit Assets 9,865,000 8,483,000
Interest Rate Swaption   0
Interest Rate Swaps 0  
Market Value Of To Be Announced Contracts 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 3,022,174,000 2,158,010,000
Margin Deposit Assets 0 0
Interest Rate Swaption   669,000
Interest Rate Swaps 9,500,000  
Market Value Of To Be Announced Contracts (1,117,000)  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 0 0
Margin Deposit Assets 0 0
Interest Rate Swaption   $ 0
Interest Rate Swaps 0  
Market Value Of To Be Announced Contracts $ 0