Financings - Commercial Mortgage Pass Through Certificates (Details) - Secured Debt $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Arroyo Trust
Debt Instrument [Line Items]
Principal Balance	$ 206,562
Carrying Value	206,562
Less: Unamortized Deferred Financing Costs	2,382
Total	204,180
Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	123,139
Carrying Value	123,139
Less: Unamortized Deferred Financing Costs	1,421
Total	121,718
Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	357,592
Carrying Value	314,243
Arroyo Mortgage Trust 2022-2
Debt Instrument [Line Items]
Principal Balance	327,737
Fair Value	317,820
CSMC Trust
Debt Instrument [Line Items]
Principal Balance	1,370,691
Fair Value	1,081,392
Class A-1A | Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	$ 71,442
Coupon	1.70%
Carrying Value	$ 71,442
Class A-1A | Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	$ 207,475
Coupon	2.50%
Carrying Value	$ 190,278
Class A-1B | Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	$ 8,477
Coupon	2.10%
Carrying Value	$ 8,477
Class A-1B | Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	$ 82,942
Coupon	3.30%
Carrying Value	$ 73,339
Class A-1 | Arroyo Trust
Debt Instrument [Line Items]
Principal Balance	$ 159,413
Coupon	3.30%
Carrying Value	$ 159,413
Class A-1 | Arroyo Mortgage Trust 2022-2
Debt Instrument [Line Items]
Principal Balance	$ 260,794
Coupon	5.00%
Fair Value	$ 254,516
Class A-1 | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 120,391
Coupon	3.30%
Fair Value	$ 109,142
Class A-2 | Arroyo Trust
Debt Instrument [Line Items]
Principal Balance	$ 8,549
Coupon	3.50%
Carrying Value	$ 8,549
Class A-2 | Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	$ 13,518
Coupon	2.90%
Carrying Value	$ 13,518
Class A-2 | Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	$ 21,168
Coupon	3.60%
Carrying Value	$ 17,002
Class A-2 | Arroyo Mortgage Trust 2022-2
Debt Instrument [Line Items]
Principal Balance	$ 22,199
Coupon	5.00%
Fair Value	$ 21,549
Class A-2 | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 531,700
Coupon	4.00%
Fair Value	$ 482,927
Class A-3 | Arroyo Trust
Debt Instrument [Line Items]
Principal Balance	$ 13,545
Coupon	3.80%
Carrying Value	$ 13,545
Class A-3 | Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	$ 17,963
Coupon	3.30%
Carrying Value	$ 17,963
Class A-3 | Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	$ 28,079
Coupon	3.70%
Carrying Value	$ 20,975
Class A-3 | Arroyo Mortgage Trust 2022-2
Debt Instrument [Line Items]
Principal Balance	$ 27,050
Coupon	5.00%
Fair Value	$ 25,947
Class B | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 136,400
Coupon	4.20%
Fair Value	$ 117,660
Class C | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 94,500
Coupon	4.30%
Fair Value	$ 77,566
Class D | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 153,950
Coupon	4.40%
Fair Value	$ 115,780
Class E | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 180,150
Coupon	4.40%
Fair Value	$ 99,911
Class F | CSMC Trust
Debt Instrument [Line Items]
Principal Balance	$ 153,600
Coupon	4.40%
Fair Value	$ 70,434
Class M-1 | Arroyo Trust
Debt Instrument [Line Items]
Principal Balance	$ 25,055
Coupon	4.80%
Carrying Value	$ 25,055
Class M-1 | Arroyo Mortgage Trust 2020
Debt Instrument [Line Items]
Principal Balance	$ 11,739
Coupon	4.30%
Carrying Value	$ 11,739
Class M-1 | Arroyo Mortgage Trust 2022
Debt Instrument [Line Items]
Principal Balance	$ 17,928
Coupon	3.70%
Carrying Value	$ 12,649
Class M-1 | Arroyo Mortgage Trust 2022-2
Debt Instrument [Line Items]
Principal Balance	$ 17,694
Coupon	5.00%
Fair Value	$ 15,808
Class X-1 | CSMC Trust
Debt Instrument [Line Items]
Coupon	0.70%
Fair Value	$ 6,604
Notional amount	$ 652,100
Class X-2 | CSMC Trust
Debt Instrument [Line Items]
Coupon	0.20%
Fair Value	$ 1,368
Notional amount	$ 733,500