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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
percent
Dec. 31, 2021
USD ($)
percent
Dec. 31, 2020
USD ($)
percent
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
The following table provides information about the relationship between compensation actually paid (as determined under SEC rules) to our principal executive officer (“PEO”) and the average our non-PEO NEOs and certain financial performance measures of the Company. For further information concerning the Company’s variable pay-for-performance philosophy and how the Company aligns executive compensation with the Company’s performance, refer to “Executive Compensation - Compensation Discussion and Analysis.”

Pay Versus Performance Table


Year
Summary Comp-
ensation Table Total for PEO (1)
Compen-
sation Actually Paid to PEO
Average
Summary
Compen-
sation
Table Total for
non-PEO
NEOs(1)
Average
Compen-
sation
Actually Paid to
non-PEO
NEOs(1)
Value of Initial Fixed $100 Investment Based on:Net Income ($ in thousands)
Total Shareholder Return(2)
Peer Group Total Shareholder Return(2) (3)
Total Economic Return Percentage(4)
2022$4,230,683 $3,702,486 $3,084,333 $2,907,635 $101.29 $69.26 $143,161 (9.4)%
20214,476,138 4,089,845 2,665,564 2,504,410 119.67 94.04 102,261 2.5 %
20203,875,179 4,813,278 1,976,652 2,327,810 117.01 81.38 177,529 15.2 %
    
Named Executive Officers, Footnote [Text Block] For 2022, 2021 and 2020, Mr. Boston served as our Chief Executive Officer or PEO. During 2022, our non-PEO NEOs were Messrs. Benedetti and Colligan and Ms. Popenoe. For 2021 and 2020, our non-PEO NEOs were Mr. Benedetti and Ms. Popenoe.    
PEO Total Compensation Amount [1] $ 4,230,683 $ 4,476,138 $ 3,875,179
PEO Actually Paid Compensation Amount $ 3,702,486 4,089,845 4,813,278
Adjustment To PEO Compensation, Footnote [Text Block]
Compensation actually paid represents the Summary Compensation Table Total adjusted for the following items:

Year 2022
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table$(1,480,618)$(609,194)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,398,422 337,235 
Increase for fair value at vesting date of awards that were granted and vested during the year— 261,096 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(401,858)(78,797)
Decrease for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year(44,143)(87,038)
Total adjustments$(528,197)$(176,698)


Year 2021
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table as well as amounts reported under the "Non-Equity Incentive Plan Compensation" column in the Summary Compensation Table for the portion of the long-term incentive component of the Executive Incentive Plan earned for performance during the three-year performance period ended December 31, 2021 that was paid in shares of the Company's common stock$(1,623,209)$(887,360)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,255,337 734,894 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(87,125)(36,999)
Increase for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year68,704 28,311 
Total adjustments$(386,293)$(161,154)
Year 2020
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table$(890,775)$(445,388)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,793,016 785,420 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(6,117)(1,927)
Increase for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year41,975 13,053 
Total adjustments$938,099 $351,158 
    
Non-PEO NEO Average Total Compensation Amount [1] $ 3,084,333 2,665,564 1,976,652
Non-PEO NEO Average Compensation Actually Paid Amount [1] $ 2,907,635 2,504,410 2,327,810
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Compensation actually paid represents the Summary Compensation Table Total adjusted for the following items:

Year 2022
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table$(1,480,618)$(609,194)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,398,422 337,235 
Increase for fair value at vesting date of awards that were granted and vested during the year— 261,096 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(401,858)(78,797)
Decrease for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year(44,143)(87,038)
Total adjustments$(528,197)$(176,698)


Year 2021
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table as well as amounts reported under the "Non-Equity Incentive Plan Compensation" column in the Summary Compensation Table for the portion of the long-term incentive component of the Executive Incentive Plan earned for performance during the three-year performance period ended December 31, 2021 that was paid in shares of the Company's common stock$(1,623,209)$(887,360)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,255,337 734,894 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(87,125)(36,999)
Increase for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year68,704 28,311 
Total adjustments$(386,293)$(161,154)
Year 2020
Adjustments to Summary Compensation Table Total to Calculate Compensation Actually PaidPEOAverage for non-PEO NEOs
Decrease for amounts reported under the "Stock Awards" column in the Summary Compensation Table$(890,775)$(445,388)
Increase for fair value at year-end of awards granted during year that remain outstanding and unvested as of year-end1,793,016 785,420 
Decrease for change in fair value from prior year-end to current year-end of awards granted in prior years that were outstanding and unvested as of year-end(6,117)(1,927)
Increase for change in fair value from prior year-end to vesting date of awards granted in prior years that vested during year41,975 13,053 
Total adjustments$938,099 $351,158 
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
The following graph illustrates the relationship between compensation actually paid to our NEOs and our TSR as well as TSR for the FTSE Mortgage REIT Index on a cumulative basis assuming investment of $100 on December 31, 2019:

dx-20230324_g49.jpg
    
Compensation Actually Paid vs. Net Income [Text Block]
The following graph compares our net income to compensation actually paid to our NEOs on an annual basis:

dx-20230324_g50.jpg

The Company accounts for its investments purchased prior to January 1, 2021 as available-for-sale with changes in fair value recorded in "other comprehensive income (loss)." Effective January 1, 2021, the Company elected the fair value option for its investments purchased on or after that date with changes in fair value reported in "net income." As a result, net income for the years presented above in the Pay versus Performance Table and in the graph above does not include other comprehensive losses of $(93.5) million, $(73.5) million, and $(188.1) million, respectively.
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
The following graph illustrates the relationship between compensation actually paid to our NEOs and our total economic return:

dx-20230324_g51.jpg
    
Total Shareholder Return Vs Peer Group [Text Block] dx-20230324_g49.jpg    
Tabular List [Table Text Block]
Financial Performance Measures

As described in greater detail in “Executive Compensation – Compensation Discussion and Analysis,” the Company’s executive compensation program reflects a variable pay-for-performance philosophy. The metrics that the Company uses for both our long-term and short-term incentive awards are selected based on an objective of incentivizing our NEOs to increase the value of our enterprise to our shareholders. The most important financial measures used by the Company to link the executive compensation actually paid to the Company's NEOs to the Company's performance for the most recently completed fiscal year are as follows:

•book value per common share
•earnings available for distribution return on equity
•absolute total economic return
•relative total economic return compared to a peer group
•relative total shareholder return compared to a peer group
    
Total Shareholder Return Amount [2] $ 101.29 119.67 117.01
Peer Group Total Shareholder Return Amount [2],[3] 69.26 94.04 81.38
Net Income (Loss) $ 143,161,000 $ 102,261,000 $ 177,529,000
Company Selected Measure Amount | percent [4] (0.094) 0.025 0.152
PEO Name Mr. Boston    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name book value per common share    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name earnings available for distribution return on equity    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name absolute total economic return    
Measure [Axis]: 4      
Pay vs Performance Disclosure [Table]      
Measure Name relative total economic return compared to a peer group    
Measure [Axis]: 5      
Pay vs Performance Disclosure [Table]      
Measure Name relative total shareholder return compared to a peer group    
PEO [Member] | Adjustment for amounts reported under Stock Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (1,480,618) $ (1,623,209) $ (890,775)
PEO [Member] | Adjustment for fair value at year-end of awards granted during year and unvested at year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 1,398,422 1,255,337 1,793,016
PEO [Member] | Adjustment for fair value at vesting date of awards vested during the year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0    
PEO [Member] | Adjustment for change in fair value from prior year end to current year end of stock awards granted in prior years that remain unvested at current year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (401,858) (87,125) (6,117)
PEO [Member] | Adjustment for change in fair value from prior year end to vesting date of awards granted in prior years that vested during current year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (44,143) 68,704 41,975
PEO [Member] | Total Equity Award Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (528,197) (386,293) 938,099
Non-PEO NEO [Member] | Adjustment for amounts reported under Stock Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (609,194) (887,360) (445,388)
Non-PEO NEO [Member] | Adjustment for fair value at year-end of awards granted during year and unvested at year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 337,235 734,894 785,420
Non-PEO NEO [Member] | Adjustment for fair value at vesting date of awards vested during the year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 261,096    
Non-PEO NEO [Member] | Adjustment for change in fair value from prior year end to current year end of stock awards granted in prior years that remain unvested at current year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (78,797) (36,999) (1,927)
Non-PEO NEO [Member] | Adjustment for change in fair value from prior year end to vesting date of awards granted in prior years that vested during current year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (87,038) 28,311 13,053
Non-PEO NEO [Member] | Total Equity Award Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (176,698) $ (161,154) $ 351,158
[1] For 2022, 2021 and 2020, Mr. Boston served as our Chief Executive Officer or PEO. During 2022, our non-PEO NEOs were Messrs. Benedetti and Colligan and Ms. Popenoe. For 2021 and 2020, our non-PEO NEOs were Mr. Benedetti and Ms. Popenoe
[2] Total Shareholder Return for the Company and the Peer Group assume $100 invested at December 31, 2019.
[3] The Peer Group Total Shareholder Return is calculated based on the FTSE NAREIT Mortgage REIT Index.
[4] Total economic return (TER) percentage is the sum of dividends declared per common share during the year plus the change in book value per common share for the year divided by the beginning book value per common share. While the Company uses numerous financial and non-financial performance measures for the purpose of evaluating performance, the Company has determined that TER is the financial measure that, in the Company’s assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by the Company to link compensation actually paid to the Company’s NEOs, for the most recently completed fiscal year, to Company performance. TER is a performance measure for our executives' PSU awards.