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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets carried at fair value    
Investment securities available for sale $ 674,161 $ 818,976
Level 3    
Assets carried at fair value    
Investment in unconsolidated entities 51,342 79,390
Fair Value, Measurements, Recurring    
Assets carried at fair value    
Residential mortgage loans, at fair value 69,512 17,769
Investment in unconsolidated entities 41,026 60,332
Total 9,366,148 7,987,218
Liabilities carried at fair value    
Total 7,991,086 6,625,394
Fair Value, Measurements, Recurring | TBA securities    
Assets carried at fair value    
Derivative assets 180,562 148,139
Fair Value, Measurements, Recurring | Interest rate swap futures    
Assets carried at fair value    
Derivative assets 1,228 444
Fair Value, Measurements, Recurring | U.S. Treasury futures    
Liabilities carried at fair value    
Derivative liabilities 193 107
Fair Value, Measurements, Recurring | Interest rate swaps    
Assets carried at fair value    
Derivative assets 18 108
Liabilities carried at fair value    
Derivative liabilities 274 391
Fair Value, Measurements, Recurring | Swaptions    
Assets carried at fair value    
Derivative assets 18 431
Fair Value, Measurements, Recurring | Eurodollar futures    
Assets carried at fair value    
Derivative assets 289 1,175
Fair Value, Measurements, Recurring | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 415,032 526,363
Fair Value, Measurements, Recurring | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 133,022 163,284
Fair Value, Measurements, Recurring | U.S. Treasury Securities    
Assets carried at fair value    
Investment securities available for sale 2,924 2,887
Fair Value, Measurements, Recurring | CMBS    
Assets carried at fair value    
Investment securities available for sale 123,183 126,442
Fair Value, Measurements, Recurring | Multi-family loans held in securitization trusts    
Assets carried at fair value    
Multi-family loans held in securitization trusts 8,399,334 6,939,844
Fair Value, Measurements, Recurring | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations 7,990,619 6,624,896
Fair Value, Measurements, Recurring | Level 1    
Assets carried at fair value    
Residential mortgage loans, at fair value 0 0
Investment in unconsolidated entities 0 0
Total 4,441 4,506
Liabilities carried at fair value    
Total 193 107
Fair Value, Measurements, Recurring | Level 1 | TBA securities    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap futures    
Assets carried at fair value    
Derivative assets 1,228 444
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury futures    
Liabilities carried at fair value    
Derivative liabilities 193 107
Fair Value, Measurements, Recurring | Level 1 | Interest rate swaps    
Assets carried at fair value    
Derivative assets 0 0
Liabilities carried at fair value    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Swaptions    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 1 | Eurodollar futures    
Assets carried at fair value    
Derivative assets 289 1,175
Fair Value, Measurements, Recurring | Level 1 | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Securities    
Assets carried at fair value    
Investment securities available for sale 2,924 2,887
Fair Value, Measurements, Recurring | Level 1 | CMBS    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Multi-family loans held in securitization trusts    
Assets carried at fair value    
Multi-family loans held in securitization trusts 0 0
Fair Value, Measurements, Recurring | Level 1 | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets carried at fair value    
Residential mortgage loans, at fair value 0 0
Investment in unconsolidated entities 0 0
Total 805,212 920,870
Liabilities carried at fair value    
Total 274 391
Fair Value, Measurements, Recurring | Level 2 | TBA securities    
Assets carried at fair value    
Derivative assets 180,562 148,139
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap futures    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury futures    
Liabilities carried at fair value    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps    
Assets carried at fair value    
Derivative assets 18 108
Liabilities carried at fair value    
Derivative liabilities 274 391
Fair Value, Measurements, Recurring | Level 2 | Swaptions    
Assets carried at fair value    
Derivative assets 18 431
Fair Value, Measurements, Recurring | Level 2 | Eurodollar futures    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 2 | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 415,032 526,363
Fair Value, Measurements, Recurring | Level 2 | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 133,022 163,284
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury Securities    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 2 | CMBS    
Assets carried at fair value    
Investment securities available for sale 76,560 82,545
Fair Value, Measurements, Recurring | Level 2 | Multi-family loans held in securitization trusts    
Assets carried at fair value    
Multi-family loans held in securitization trusts 0 0
Fair Value, Measurements, Recurring | Level 2 | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations 0 0
Fair Value, Measurements, Recurring | Level 3    
Assets carried at fair value    
Residential mortgage loans, at fair value 69,512 17,769
Investment in unconsolidated entities 41,026 60,332
Total 8,556,495 7,061,842
Liabilities carried at fair value    
Total 7,990,619 6,624,896
Fair Value, Measurements, Recurring | Level 3 | TBA securities    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap futures    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury futures    
Liabilities carried at fair value    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Interest rate swaps    
Assets carried at fair value    
Derivative assets 0 0
Liabilities carried at fair value    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Swaptions    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Eurodollar futures    
Assets carried at fair value    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury Securities    
Assets carried at fair value    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | CMBS    
Assets carried at fair value    
Investment securities available for sale 46,623 43,897
Fair Value, Measurements, Recurring | Level 3 | Multi-family loans held in securitization trusts    
Assets carried at fair value    
Multi-family loans held in securitization trusts 8,399,334 6,939,844
Fair Value, Measurements, Recurring | Level 3 | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations $ 7,990,619 $ 6,624,896