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Mortgage Loans Held for Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Fixed-rate single-family mortgages $ 4,997,089 $ 5,030,333
Premiums 87,883 82,108
Discounts (2,776) (3,616)
Hedging adjustments 14,203 13,632
Total mortgage loans held for portfolio (2) [1] 5,096,399 5,122,457
Allowance for credit losses on mortgage loans (6,654) (7,832)
Mortgage loans held for portfolio, net 5,089,745 5,114,625
Real Estate Loan [Member]    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Accrued Interest - Mortgage loans held for portfolio 27,200 26,900
Fixed-rate long-term single-family mortgages (1) | Single Family [Member]    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Fixed-rate single-family mortgages [2] 4,818,470 4,863,177
Fixed-rate medium-term single-family mortgages (1) | Single Family [Member]    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Fixed-rate single-family mortgages [2] $ 178,619 $ 167,156
[1] Amounts exclude accrued interest receivable of $27.2 million and $26.9 million at September 30, 2020 and December 31, 2019.
[2] Long-term is defined as greater than 15 years. Medium-term is defined as a term of 15 years or less.