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Schedule of Mortgage-Backed Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Mortgage-Backed Securities [Line Items]
Mortgage-backed securities, at fair value	$ 1,050,521	$ 1,401,778
Residential Mortgage Backed Securities [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	963,646	1,305,706
Unamortized Premium (Discount)	37,041	52,428
Amortized Cost	1,017,953	1,375,929
Gross Unrealized Gain on Securities	36,788	28,518
Gross Unrealized Losses on Securities	(4,220)	(2,669)
Mortgage-backed securities, at fair value	$ 1,050,521	$ 1,401,778
Weighted Average Coupon	3.94%	3.98%
Weighted Average Yield	3.11%	3.17%
Weighted Average Life (Years)	4 years 29 days	5 years 11 months 1 day
Non-Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 10,507	$ 10,947
Unamortized Premium (Discount)	(3,887)	(4,023)
Amortized Cost	6,620	6,924
Gross Unrealized Gain on Securities	1,395	1,928
Gross Unrealized Losses on Securities	(495)	(1)
Mortgage-backed securities, at fair value	$ 7,520	$ 8,851
Weighted Average Coupon	3.26%	3.73%
Weighted Average Yield	10.81%	13.48%
Weighted Average Life (Years)	5 years 1 month 6 days	5 years 11 months 4 days
15-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 124,511	$ 173,350
Unamortized Premium (Discount)	2,519	3,498
Amortized Cost	127,030	176,848
Gross Unrealized Gain on Securities	5,347	4,424
Gross Unrealized Losses on Securities	(2)	(41)
Mortgage-backed securities, at fair value	$ 132,375	$ 181,231
Weighted Average Coupon	3.53%	3.45%
Weighted Average Yield	2.92%	2.89%
Weighted Average Life (Years)	3 years 7 months 28 days	4 years 21 days
20-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 1,087	$ 1,276
Unamortized Premium (Discount)	78	80
Amortized Cost	1,165	1,356
Gross Unrealized Gain on Securities	22	29
Gross Unrealized Losses on Securities	0	0
Mortgage-backed securities, at fair value	$ 1,187	$ 1,385
Weighted Average Coupon	5.00%	5.00%
Weighted Average Yield	3.42%	3.34%
Weighted Average Life (Years)	4 years 5 months 15 days	5 years 1 month 2 days
30-year fixed rate mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 708,062	$ 996,451
Unamortized Premium (Discount)	30,759	45,099
Amortized Cost	738,821	1,041,550
Gross Unrealized Gain on Securities	27,106	19,676
Gross Unrealized Losses on Securities	(707)	(2,348)
Mortgage-backed securities, at fair value	$ 765,220	$ 1,058,878
Weighted Average Coupon	4.13%	4.18%
Weighted Average Yield	3.05%	3.12%
Weighted Average Life (Years)	4 years 2 months 23 days	6 years 8 months 15 days
Adjustable Rate Mortgages | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 28,823	$ 32,122
Unamortized Premium (Discount)	1,013	927
Amortized Cost	29,836	33,049
Gross Unrealized Gain on Securities	490	264
Gross Unrealized Losses on Securities	(93)	(58)
Mortgage-backed securities, at fair value	$ 30,233	$ 33,255
Weighted Average Coupon	3.74%	3.79%
Weighted Average Yield	2.13%	2.41%
Weighted Average Life (Years)	3 years 1 month 17 days	4 years 2 months 12 days
Reverse mortgages [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 90,656	$ 91,560
Unamortized Premium (Discount)	6,559	6,847
Amortized Cost	97,215	98,407
Gross Unrealized Gain on Securities	1,951	1,549
Gross Unrealized Losses on Securities	(809)	(22)
Mortgage-backed securities, at fair value	$ 98,357	$ 99,934
Weighted Average Coupon	4.49%	4.53%
Weighted Average Yield	2.78%	2.73%
Weighted Average Life (Years)	5 years 4 months 9 days	5 years 7 months 28 days
Interest-Only [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Amortized Cost	$ 17,266	$ 17,795
Gross Unrealized Gain on Securities	477	648
Gross Unrealized Losses on Securities	(2,114)	(199)
Mortgage-backed securities, at fair value	$ 15,629	$ 18,244
Weighted Average Coupon	3.25%	3.22%
Weighted Average Yield	7.92%	9.11%
Weighted Average Life (Years)	3 years 3 months 7 days	3 years 11 months 19 days
Agency Securities [Member] | Agency RMBS [Member]
Mortgage-Backed Securities [Line Items]
Current Principal	$ 953,139	$ 1,294,759
Unamortized Premium (Discount)	40,928	56,451
Amortized Cost	1,011,333	1,369,005
Gross Unrealized Gain on Securities	35,393	26,590
Gross Unrealized Losses on Securities	(3,725)	(2,668)
Mortgage-backed securities, at fair value	$ 1,043,001	$ 1,392,927
Weighted Average Coupon	3.94%	3.99%
Weighted Average Yield	3.06%	3.12%
Weighted Average Life (Years)	4 years 25 days	5 years 11 months 1 day

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