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SECURITIES - Weighted Average Life (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Estimated Fair Value |  |  |  |
Total | [1] | $ 104,993,271 | $ 92,623,788 | [2]
Amortized Cost |  |  |  |
Total |  | 105,471,037 | 94,853,660 |
Residential Investments |  |  |  |
Estimated Fair Value |  |  |  |
Less than one year |  | 13,863 | 13,447 |
Greater than one year through five years |  | 16,081,685 | 11,710,172 |
Greater than five years through ten years |  | 87,693,108 | 80,202,479 |
Greater than ten years |  | 1,029,384 | 540,932 |
Total |  | 104,818,040 | 92,467,030 |
Amortized Cost |  |  |  |
Less than one year |  | 14,032 | 13,670 |
Greater than one year through five years |  | 16,091,945 | 11,928,973 |
Greater than five years through ten years |  | 88,181,059 | 82,218,464 |
Greater than ten years |  | 1,012,025 | 536,594 |
Total |  | $ 105,299,061 | $ 94,697,701 |
[1] | (3) Excludes $273.4 million and $83.6 million at March 31, 2019 and December 31, 2018, respectively, of non-Agency mortgage-backed securities and $246.6 million and $224.3 million at March 31, 2019 and December 31, 2018, respectively, of commercial mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.
[2] | (1) Derived from the audited consolidated financial statements at December 31, 2018.

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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