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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets carried at fair value    
Investment securities available for sale $ 1,400,370 $ 1,413,081
Level 3    
Assets carried at fair value    
Investments in unconsolidated entities 51,990 51,212
Fair Value, Measurements, Recurring    
Assets carried at fair value    
Residential mortgage loans, at fair value 99,480 87,153
Investments in unconsolidated entities 43,504 42,823
Total 10,991,478 11,201,324
Liabilities carried at fair value    
Total 8,953,467 9,189,459
Fair Value, Measurements, Recurring | Interest rate swaps    
Assets carried at fair value    
Derivative assets 9,815 846
Fair Value, Measurements, Recurring | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 1,161,445 1,169,536
Fair Value, Measurements, Recurring | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 99,212 102,125
Fair Value, Measurements, Recurring | CMBS    
Assets carried at fair value    
Investment securities available for sale 139,713 141,420
Fair Value, Measurements, Recurring | Multi-family loans held in securitization trusts    
Assets carried at fair value    
Multi-family loans held in securitization trusts 9,438,309 9,657,421
Fair Value, Measurements, Recurring | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations 8,953,467 9,189,459
Fair Value, Measurements, Recurring | Level 1    
Assets carried at fair value    
Residential mortgage loans, at fair value 0 0
Investments in unconsolidated entities 0 0
Total 0 0
Liabilities carried at fair value    
Total 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swaps    
Assets carried at fair value    
Derivative assets 0 0
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 | 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
Investments in unconsolidated entities 0 0
Total 1,361,328 1,366,005
Liabilities carried at fair value    
Total 0 0
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps    
Assets carried at fair value    
Derivative assets 9,815 846
Fair Value, Measurements, Recurring | Level 2 | Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 1,161,445 1,169,536
Fair Value, Measurements, Recurring | Level 2 | Non-Agency RMBS    
Assets carried at fair value    
Investment securities available for sale 99,212 102,125
Fair Value, Measurements, Recurring | Level 2 | CMBS    
Assets carried at fair value    
Investment securities available for sale 90,856 93,498
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 99,480 87,153
Investments in unconsolidated entities 43,504 42,823
Total 9,630,150 9,835,319
Liabilities carried at fair value    
Total 8,953,467 9,189,459
Fair Value, Measurements, Recurring | Level 3 | Interest rate swaps    
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 | CMBS    
Assets carried at fair value    
Investment securities available for sale 48,857 47,922
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 9,438,309 9,657,421
Fair Value, Measurements, Recurring | Level 3 | Multi-family collateralized debt obligations    
Liabilities carried at fair value    
Multi-family collateralized debt obligations $ 8,953,467 $ 9,189,459