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Mortgage Loans Held for Portfolio (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Par Value $ 4,432,458 $ 4,231,206    
Premiums 66,776 67,671    
Discounts (1,607) (1,800)    
Deferred derivative gains, net 4,124 2,825    
Total mortgage loans held for portfolio 4,501,751 4,299,902    
Allowance for credit losses (500) (500)    
Total mortgage loans, net of allowance for credit losses $ 4,501,251 4,299,402    
Fixed-rate 15-year single-family mortgages        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Original contractual terms 15 years      
Minimum [Member] | Fixed-rate 20- and 30-year single-family mortgages        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Original contractual terms 20 years      
Maximum [Member] | Fixed-rate 20- and 30-year single-family mortgages        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Original contractual terms 30 years      
Government Mortgage Loans [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Par Value $ 292,203 328,651    
Single Family [Member] | Fixed-rate 15-year single-family mortgages        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Par Value 339,042 392,128    
Single Family [Member] | Fixed-rate 20- and 30-year single-family mortgages        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Par Value 4,093,416 3,839,078    
Conventional Mortgage Loans [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Par Value 4,140,255 3,902,555    
Allowance for credit losses $ (500) $ (500) $ (500) $ (650)