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Debt Securities Available for Sale - Fair value of the debt securities of issuers (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment |  |
Amortized Cost | $ 24,241,078 | $ 21,035,610
Debt Securities Available for sale, at fair value | 24,391,226 | 21,561,152
FNMA |  |
Investment |  |
Amortized Cost | 1,674,044 | 2,242,121
Debt Securities Available for sale, at fair value | 1,747,848 | 2,338,897
Freddie Mac |  |
Investment |  |
Amortized Cost | 3,417,413 | 3,616,238
Debt Securities Available for sale, at fair value | $ 3,394,380 | $ 3,675,679

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