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Fair Value, Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets [Abstract]    
Derivative assets total $ 17,646 $ 15,970
Servicing related assets [1] 211,995 174,414
Liabilities [Abstract]    
Derivative liabilities total 920 5,878
Interest Rate Swaps [Member]    
Assets [Abstract]    
Derivative assets total 15,164 10,791
Interest Rate Swaptions [Member]    
Assets [Abstract]    
Derivative assets total 1,516 798
TBAs [Member]    
Assets [Abstract]    
Derivative assets total 883 4,129
U.S. Treasury Futures [Member]    
Assets [Abstract]    
Derivative assets total   252
U.S. Treasury Futures Options [Member]    
Assets [Abstract]    
Derivative assets total 83  
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 17,646 15,970
Servicing related assets 0 0
Total Assets 1,016,445 1,244,221
Liabilities [Abstract]    
Derivative liabilities total 920 5,878
Total Liabilities 920 5,878
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Servicing related assets 211,995 174,414
Total Assets 211,995 174,414
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 15,164 10,791
Liabilities [Abstract]    
Derivative liabilities total 896 5,878
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 1,516 798
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
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 883 4,129
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0 0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total   0
Liabilities [Abstract]    
Derivative liabilities total 0  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total   252
Liabilities [Abstract]    
Derivative liabilities total 24  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total   0
Liabilities [Abstract]    
Derivative liabilities total 0  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 1 [Member]    
Assets [Abstract]    
Derivative assets total 0  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 2 [Member]    
Assets [Abstract]    
Derivative assets total 83  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 3 [Member]    
Assets [Abstract]    
Derivative assets total 0  
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Assets [Abstract]    
Derivative assets total 17,646 15,970
Servicing related assets 211,995 174,414
Total Assets 1,228,440 1,418,635
Liabilities [Abstract]    
Derivative liabilities total 920 5,878
Total Liabilities 920 5,878
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Interest Rate Swaps [Member]    
Assets [Abstract]    
Derivative assets total 15,164 10,791
Liabilities [Abstract]    
Derivative liabilities total 896 5,878
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Interest Rate Swaptions [Member]    
Assets [Abstract]    
Derivative assets total 1,516 798
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | TBAs [Member]    
Assets [Abstract]    
Derivative assets total 883 4,129
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. Treasury Futures [Member]    
Assets [Abstract]    
Derivative assets total   $ 252
Liabilities [Abstract]    
Derivative liabilities total 24  
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. Treasury Futures Options [Member]    
Assets [Abstract]    
Derivative assets total $ 83  
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 998,799 1,228,251
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total 0 0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Private Label MBS [Member] | Level 1 [Member]    
Assets [Abstract]    
RMBS total   0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Private Label MBS [Member] | Level 2 [Member]    
Assets [Abstract]    
RMBS total   6,141
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Private Label MBS [Member] | Level 3 [Member]    
Assets [Abstract]    
RMBS total   0
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Assets [Abstract]    
RMBS total 998,799 1,228,251
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Private Label MBS [Member]    
Assets [Abstract]    
RMBS total   6,141
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 617,044 715,156
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 617,044 715,156
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 381,755 506,954
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 $ 381,755 $ 506,954
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] See Note 9 regarding the estimation of fair value, which approximates carrying value for all pools.