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Fair Value, Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets [Abstract]    
Derivative assets total $ 26,751 $ 24,258
Servicing related assets [1] 255,845 294,907
Liabilities [Abstract]    
Derivative liabilities total 16,916 3,816
Interest Rate Swaps [Member]    
Assets [Abstract]    
Derivative assets total 26,745 23,176
Interest Rate Swaptions [Member]    
Assets [Abstract]    
Derivative assets total 6 170
TBAs [Member]    
Assets [Abstract]    
Derivative assets total 0 168
Treasury Futures [Member]    
Assets [Abstract]    
Derivative assets total   744
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Servicing related assets 0 0
Total Assets 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Total Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 26,751 24,258
Servicing related assets 0 0
Total Assets 2,509,988 1,794,368
Liabilities [Abstract]    
Derivative liabilities total 16,916 3,816
Total Liabilities 16,916 3,816
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Servicing related assets 255,845 294,907
Total Assets 255,845 294,907
Liabilities [Abstract]    
Derivative liabilities total 0 0
Total Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 26,745 23,176
Liabilities [Abstract]    
Derivative liabilities total 14,649 3,816
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaptions [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaptions [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 6 170
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaptions [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 0 168
Liabilities [Abstract]    
Derivative liabilities total 616 0
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | Treasury Futures [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | Treasury Futures [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 0 744
Liabilities [Abstract]    
Derivative liabilities total 1,651 0
Fair Value, Measurements, Recurring [Member] | Treasury Futures [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Liabilities [Abstract]    
Derivative liabilities total 0 0
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Assets [Abstract]    
Derivative assets total 26,751 24,258
Servicing related assets 255,845 294,907
Total Assets 2,765,833 2,089,275
Liabilities [Abstract]    
Derivative liabilities total 16,916 3,816
Total Liabilities 16,916 3,816
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Interest Rate Swaps [Member]    
Assets [Abstract]    
Derivative assets total 26,745 23,176
Liabilities [Abstract]    
Derivative liabilities total 14,649 3,816
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Interest Rate Swaptions [Member]    
Assets [Abstract]    
Derivative assets total 6 170
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | TBAs [Member]    
Assets [Abstract]    
Derivative assets total 0 168
Liabilities [Abstract]    
Derivative liabilities total 616 0
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Treasury Futures [Member]    
Assets [Abstract]    
Derivative assets total 0 744
Liabilities [Abstract]    
Derivative liabilities total $ 1,651 $ 0
RMBS [Member] | Level 2 [Member]    
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract]    
Percentage of derivative instruments classified as fair value assets and liabilities 100.00% 100.00%
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets [Abstract]    
RMBS total $ 0 $ 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets [Abstract]    
RMBS total 2,483,237 1,770,110
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | CMOs [Member] | Level 1 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | CMOs [Member] | Level 2 [Member]    
Assets [Abstract]    
RMBS total 163,756 132,938
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | CMOs [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Assets [Abstract]    
RMBS total 2,483,237 1,770,110
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | CMOs [Member]    
Assets [Abstract]    
RMBS total 163,756 132,938
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae [Member] | Level 1 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae [Member] | Level 2 [Member]    
Assets [Abstract]    
RMBS total 1,617,345 1,178,164
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae [Member] | Carrying Value [Member]    
Assets [Abstract]    
RMBS total 1,617,345 1,178,164
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Freddie Mac [Member] | Level 1 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Freddie Mac [Member] | Level 2 [Member]    
Assets [Abstract]    
RMBS total 702,136 459,008
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Freddie Mac [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Freddie Mac [Member] | Carrying Value [Member]    
Assets [Abstract]    
RMBS total $ 702,136 $ 459,008
MSRs [Member] | Level 3 [Member]    
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract]    
Percentage of derivative instruments classified as fair value assets and liabilities 100.00% 100.00%
Derivative Instruments [Member] | Level 2 [Member]    
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract]    
Percentage of derivative instruments classified as fair value assets and liabilities 100.00% 100.00%
[1] Carrying value represents the fair value of the pools (see Note 9).