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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

X

- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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-Section 50
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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
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