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Debt Securities Available for Sale - Fair value of the debt securities of issuers (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment |  |
Amortized Cost | $ 16,660,662 | $ 13,478,562
FNMA |  |
Investment |  |
Amortized Cost | 3,502,643 | 2,999,110
Fair Value | 3,494,538 | 2,901,904
Freddie Mac |  |
Investment |  |
Amortized Cost | 1,770,076 | 1,095,855
Fair Value | $ 1,774,321 | $ 1,058,013

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