SECURITIES - Weighted Average Life (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Estimated Fair Value
Total	[1]	$ 75,652,396	$ 114,833,580
Amortized Cost
Total		72,487,080	112,863,385
Residential Investments
Estimated Fair Value
Less than one year		110,203	3,997
Greater than one year through five years		45,643,138	36,290,254
Greater than five years through ten years		28,509,058	77,732,756
Greater than ten years		1,309,255	533,550
Total		75,571,654	114,560,557
Amortized Cost
Less than one year		109,540	4,543
Greater than one year through five years		43,404,877	35,581,833
Greater than five years through ten years		27,610,923	76,504,845
Greater than ten years		1,279,353	506,719
Total		$ 72,404,693	$ 112,597,940

[1] Excludes $81.5 million and $102.5 million at December 31, 2020 and 2019, respectively, of agency mortgage-backed securities, $576.6 million and $468.0 million at December 31, 2020 and 2019, respectively, of non-Agency mortgage-backed securities and $391.0 million and $500.3 million at December 31, 2020 and December 31, 2019, respectively, of commercial mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.