Schedule IV - Mortgage Loans on Real Estate - Product Type (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	5,461
UPB	$ 10,857,984
UPB of loans subject to DQ principal or interest	1,147,787
General allowance for loan losses	(44,473)	$ (57,710)
Total Loans	$ 10,713,084	$ 10,007,232	$ 7,311,740	$ 4,100,064
Bridge
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	511
Carrying Value	$ 6,796,082
UPB	6,837,816
UPB of loans subject to DQ principal or interest	$ 628,940
Bridge | 0 - 500k
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	77
Carrying Value	$ 12,934
UPB	12,969
UPB of loans subject to DQ principal or interest	$ 26
Bridge | 0 - 500k | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.11%
Bridge | 0 - 500k | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.91%
Bridge | 500k - 1mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	34
Carrying Value	$ 25,131
UPB	25,135
UPB of loans subject to DQ principal or interest	$ 1,287
Bridge | 500k - 1mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.49%
Bridge | 500k - 1mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.61%
Bridge | 1mm - 1.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	10
Carrying Value	$ 12,590
UPB	$ 12,624
Bridge | 1mm - 1.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.91%
Bridge | 1mm - 1.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.29%
Bridge | 1.5mm - 2mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	13
Carrying Value	$ 22,865
UPB	22,920
UPB of loans subject to DQ principal or interest	$ 1,864
Bridge | 1.5mm - 2mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.71%
Bridge | 1.5mm - 2mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.36%
Bridge | 2mm - 2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	10
Carrying Value	$ 22,874
UPB	22,978
UPB of loans subject to DQ principal or interest	$ 2,280
Bridge | 2mm - 2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.81%
Bridge | 2mm - 2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.71%
Bridge | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	367
Carrying Value	$ 6,699,688
UPB	6,741,190
UPB of loans subject to DQ principal or interest	$ 623,483
Bridge | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	5.00%
Bridge | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	14.25%
Fixed rate
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	234
Carrying Value	$ 1,031,830
UPB	1,032,641
UPB of loans subject to DQ principal or interest	$ 49,124
Fixed rate | 0 - 500k
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	8
Carrying Value	$ 2,082
UPB	$ 2,061
Fixed rate | 0 - 500k | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	4.69%
Fixed rate | 0 - 500k | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	9.20%
Fixed rate | 500k - 1mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	27
Carrying Value	$ 22,053
UPB	$ 21,878
Fixed rate | 500k - 1mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	4.50%
Fixed rate | 500k - 1mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.67%
Fixed rate | 1mm - 1.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	36
Carrying Value	$ 44,256
UPB	44,771
UPB of loans subject to DQ principal or interest	$ 3,222
Fixed rate | 1mm - 1.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	4.59%
Fixed rate | 1mm - 1.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.00%
Fixed rate | 1.5mm - 2mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	21
Carrying Value	$ 37,028
UPB	37,136
UPB of loans subject to DQ principal or interest	$ 1,662
Fixed rate | 1.5mm - 2mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	4.25%
Fixed rate | 1.5mm - 2mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	6.34%
Fixed rate | 2mm - 2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	27
Carrying Value	$ 59,299
UPB	59,959
UPB of loans subject to DQ principal or interest	$ 2,224
Fixed rate | 2mm - 2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	4.48%
Fixed rate | 2mm - 2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.00%
Fixed rate | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	115
Carrying Value	$ 867,112
UPB	866,836
UPB of loans subject to DQ principal or interest	$ 42,016
Fixed rate | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.39%
Fixed rate | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.32%
Construction
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	123
Carrying Value	$ 1,180,635
UPB	1,212,526
UPB of loans subject to DQ principal or interest	$ 428,565
Construction | 0 - 500k
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	9
Carrying Value	$ 2,568
UPB	2,676
UPB of loans subject to DQ principal or interest	$ 1,160
Construction | 0 - 500k | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.00%
Construction | 0 - 500k | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	18.00%
Construction | 500k - 1mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	11
Carrying Value	$ 9,335
UPB	9,558
UPB of loans subject to DQ principal or interest	$ 3,345
Construction | 500k - 1mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.00%
Construction | 500k - 1mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.62%
Construction | 1mm - 1.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	13
Carrying Value	$ 14,656
UPB	15,785
UPB of loans subject to DQ principal or interest	$ 10,999
Construction | 1mm - 1.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	5.96%
Construction | 1mm - 1.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.00%
Construction | 1.5mm - 2mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	11
Carrying Value	$ 18,911
UPB	20,098
UPB of loans subject to DQ principal or interest	$ 16,546
Construction | 1.5mm - 2mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	9.75%
Construction | 1.5mm - 2mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.00%
Construction | 2mm - 2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	10
Carrying Value	$ 22,177
UPB	22,334
UPB of loans subject to DQ principal or interest	$ 11,157
Construction | 2mm - 2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.00%
Construction | 2mm - 2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.00%
Construction | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	69
Carrying Value	$ 1,112,988
UPB	1,142,075
UPB of loans subject to DQ principal or interest	$ 385,358
Construction | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	0.00%
Construction | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	18.00%
Freddie Mac
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	7
Carrying Value	$ 30,455
UPB	$ 30,448
Freddie Mac | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	7
Carrying Value	$ 30,455
UPB	$ 30,448
Freddie Mac | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.28%
Freddie Mac | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	6.64%
SBA 7(a)
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	3,385
Carrying Value	$ 1,264,099
UPB	1,286,728
UPB of loans subject to DQ principal or interest	$ 31,289
SBA 7(a) | 0 - 500k
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	2,690
Carrying Value	$ 241,252
UPB	252,460
UPB of loans subject to DQ principal or interest	$ 18,438
SBA 7(a) | 0 - 500k | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	0.00%
SBA 7(a) | 0 - 500k | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	15.00%
SBA 7(a) | 500k - 1mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	336
Carrying Value	$ 236,970
UPB	242,092
UPB of loans subject to DQ principal or interest	$ 6,806
SBA 7(a) | 500k - 1mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	5.00%
SBA 7(a) | 500k - 1mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.50%
SBA 7(a) | 1mm - 1.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	128
Carrying Value	$ 154,308
UPB	156,094
UPB of loans subject to DQ principal or interest	$ 2,375
SBA 7(a) | 1mm - 1.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	9.50%
SBA 7(a) | 1mm - 1.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.50%
SBA 7(a) | 1.5mm - 2mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	75
Carrying Value	$ 127,473
UPB	128,858
UPB of loans subject to DQ principal or interest	$ 1,562
SBA 7(a) | 1.5mm - 2mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	7.25%
SBA 7(a) | 1.5mm - 2mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.25%
SBA 7(a) | 2mm - 2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	42
Carrying Value	$ 94,510
UPB	95,133
UPB of loans subject to DQ principal or interest	$ 2,108
SBA 7(a) | 2mm - 2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	6.00%
SBA 7(a) | 2mm - 2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.25%
SBA 7(a) | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	114
Carrying Value	$ 409,586
UPB	$ 412,091
SBA 7(a) | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	9.25%
SBA 7(a) | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.25%
Other
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	1,201
Carrying Value	$ 454,456
UPB	457,825
UPB of loans subject to DQ principal or interest	$ 9,869
Other | 0 - 500k
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	1,010
Carrying Value	$ 192,653
UPB	195,519
UPB of loans subject to DQ principal or interest	$ 6,129
Other | 0 - 500k | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	1.00%
Other | 0 - 500k | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.13%
Other | 500k - 1mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	126
Carrying Value	$ 86,918
UPB	87,149
UPB of loans subject to DQ principal or interest	$ 2,667
Other | 500k - 1mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.00%
Other | 500k - 1mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.00%
Other | 1mm - 1.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	29
Carrying Value	$ 33,207
UPB	33,446
UPB of loans subject to DQ principal or interest	$ 1,073
Other | 1mm - 1.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	1.00%
Other | 1mm - 1.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	11.50%
Other | 1.5mm - 2mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	16
Carrying Value	$ 27,475
UPB	$ 27,442
Other | 1.5mm - 2mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.50%
Other | 1.5mm - 2mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	10.00%
Other | 2mm - 2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	7
Carrying Value	$ 15,698
UPB	$ 15,559
Other | 2mm - 2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.88%
Other | 2mm - 2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	8.56%
Other | >2.5mm
Schedule IV - Mortgage Loans on Real Estate
Loan Count | loan	13
Carrying Value	$ 98,505
UPB	$ 98,710
Other | >2.5mm | Minimum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	3.65%
Other | >2.5mm | Maximum
Schedule IV - Mortgage Loans on Real Estate
Interest Rate	12.00%