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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]                      
Interest expense $ 107,063 $ 90,646 $ 90,223 $ 89,139 $ 87,299 $ 78,062 $ 78,273 $ 64,467 $ 377,071 $ 308,101 $ 254,668
NET INTEREST INCOME 21,873 19,603 17,500 19,752 15,040 13,320 15,708 13,918 78,728 57,986 64,638
Unrealized gain on multi-family loans and debt held in securitization trusts, net $ 5,714 $ 12,303 $ 12,019 $ 7,545 $ 268 $ 1,192 $ (1,051) $ 1,546 37,581 18,872 3,032
NET INCOME                 104,795 88,567 67,560
Consolidated K-Series                      
Condensed Income Statements, Captions [Line Items]                      
Interest income                 358,712 297,124 249,191
Interest expense                 313,102 261,665 222,553
NET INTEREST INCOME                 45,610 35,459 26,638
Unrealized gain on multi-family loans and debt held in securitization trusts, net                 37,581 18,872 3,032
NET INCOME                 $ 83,191 $ 54,331 $ 29,670