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Statements of Capital - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period $ 3,607,359 $ 3,265,130 $ 3,244,778
Comprehensive income 320,449 227,202 246,777
Proceeds from sale of capital stock 1,854,487 1,800,880 1,067,674
Repurchase of capital stock (2,514,211) (1,555,438) (1,186,589)
Shares reclassified to mandatorily redeemable capital stock 0 (309) (8,670)
Cash dividends on capital stock (122,772) (130,106) (98,840)
Period end 3,145,312 3,607,359 3,265,130
Retained Earnings, Unrestricted      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period 1,084,342 1,041,033 987,711
Cumulative effect of change in accounting principle 175    
Comprehensive income 152,592 173,415 152,162
Cash dividends on capital stock (122,772) (130,106) (98,840)
Period end 1,114,337 1,084,342 1,041,033
Retained Earnings, Restricted      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period 310,670 267,316 229,275
Comprehensive income 38,147 43,354 38,041
Period end 348,817 310,670 267,316
Retained Earnings, Total      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period 1,395,012 1,308,349 1,216,986
Cumulative effect of change in accounting principle 175    
Comprehensive income 190,739 216,769 190,203
Cash dividends on capital stock (122,772) (130,106) (98,840)
Period end 1,463,154 1,395,012 1,308,349
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period (316,507) (326,940) (383,514)
Cumulative effect of change in accounting principle (175)    
Comprehensive income 129,710 10,433 56,574
Period end $ (186,972) $ (316,507) $ (326,940)
Common Class B [Member] | Capital Stock Class B - Putable      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning of period, shares 25,289 22,837 24,113
Beginning of period $ 2,528,854 $ 2,283,721 $ 2,411,306
Proceeds from sale of capital stock, shares 18,544 18,009 10,677
Proceeds from sale of capital stock $ 1,854,487 $ 1,800,880 $ 1,067,674
Repurchase of capital stock, shares (25,142) (15,554) (11,866)
Repurchase of capital stock $ (2,514,211) $ (1,555,438) $ (1,186,589)
Shares reclassified to mandatorily redeemable capital stock, shares   (3) (87)
Shares reclassified to mandatorily redeemable capital stock   $ (309) $ (8,670)
Period end, shares 18,691 25,289 22,837
Period end $ 1,869,130 $ 2,528,854 $ 2,283,721