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Debt Securities Available for Sale - Fair value of the debt securities of issuers (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment |  |
Amortized Cost | $ 16,351,743 | $ 13,478,562
FNMA |  |
Investment |  |
Amortized Cost | 3,334,102 | 2,999,110
Fair Value | 3,351,007 | 2,901,904
Freddie Mac |  |
Investment |  |
Amortized Cost | 1,722,954 | 1,095,855
Fair Value | $ 1,739,165 | $ 1,058,013

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