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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Income Statements, Captions [Line Items]                      
Interest expense $ 87,299 $ 78,062 $ 78,273 $ 64,467 $ 63,575 $ 64,007 $ 63,102 $ 63,984      
NET INTEREST INCOME 15,040 13,320 15,708 13,918 14,814 15,518 16,664 17,642 $ 57,986 $ 64,638 $ 76,117
Unrealized gain on multi-family loans and debt held in securitization trusts, net $ 13,688 $ 2,353 $ 1,447 $ 1,384 $ 8,664 $ 1,563 $ (667) $ (2,490) 18,872 3,032 12,368
NET INCOME                 88,567 67,560 78,013
Consolidated K-Series                      
Condensed Income Statements, Captions [Line Items]                      
Interest income                 297,124 249,191 257,417
Interest expense                 261,665 222,553 232,971
NET INTEREST INCOME                 35,459 26,638 24,446
Unrealized gain on multi-family loans and debt held in securitization trusts, net                 18,872 3,032 12,368
NET INCOME                 $ 54,331 $ 29,670 $ 36,814