Loans and Allowance for Credit Losses - Delinquency (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Loan delinquency information
Total Loans Carrying Value	$ 4,517,066	$ 4,052,970
Non-Accrual Loans	150,637	134,158
General allowance for loan losses	(27,403)	(29,539)
Total Loans, net of allowance for loan losses, including loans in consolidated VIEs	$ 4,489,663	$ 4,023,431
Percentage of loans outstanding	100.00%	100.00%
Percentage of outstanding, Non-Accrual Loans	3.30%	3.30%
Percentage of outstandings - Accruing	0.00%	0.00%
Specific allowance for loan losses	$ 18,200	$ 17,200
Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	$ 4,314,703	$ 3,873,203
Percentage of loans outstanding	95.60%	95.60%
30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	$ 78,562	$ 38,436
Percentage of loans outstanding	1.70%	0.90%
60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	$ 123,801	$ 141,331
Percentage of loans outstanding	2.70%	3.50%
Originated Transitional loans
Loan delinquency information
Total Loans Carrying Value	$ 1,873,164	$ 1,319,074
Non-Accrual Loans	39,574	19,416
General allowance for loan losses	(14,848)	(14,995)
Originated Transitional loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	1,794,270	1,281,579
Originated Transitional loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	30,315	17,713
Originated Transitional loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	48,579	19,782
Originated SBC loans
Loan delinquency information
Total Loans Carrying Value	1,039,537	1,056,555
Non-Accrual Loans	38,599	37,635
General allowance for loan losses	(2,729)	(2,640)
Originated SBC loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	993,570	1,000,878
Originated SBC loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	16,953	6,591
Originated SBC loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	29,014	49,086
Acquired loans
Loan delinquency information
Total Loans Carrying Value	990,301	1,046,109
Non-Accrual Loans	54,750	57,020
General allowance for loan losses	(4,335)	(5,457)
Acquired loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	934,265	978,346
Acquired loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	14,485	7,729
Acquired loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	41,551	60,034
Acquired SBA 7(a) loans
Loan delinquency information
Total Loans Carrying Value	225,020	239,438
Non-Accrual Loans	8,436	9,001
General allowance for loan losses	(627)	(767)
Acquired SBA 7(a) loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	221,444	228,651
Acquired SBA 7(a) loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	2,020	4,008
Acquired SBA 7(a) loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	1,556	6,779
Originated SBC loans, at fair value
Loan delinquency information
Total Loans Carrying Value	13,618	13,795
Originated SBC loans, at fair value \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	13,618	13,795
Originated SBA 7(a) loans
Loan delinquency information
Total Loans Carrying Value	372,288	374,791
Non-Accrual Loans	7,076	8,668
General allowance for loan losses	(4,864)	(5,680)
Originated SBA 7(a) loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	356,600	369,416
Originated SBA 7(a) loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value	14,789	1,741
Originated SBA 7(a) loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	899	3,634
Originated Residential Agency loans
Loan delinquency information
Total Loans Carrying Value	3,138	3,208
Non-Accrual Loans	2,202	2,418
Originated Residential Agency loans \| Current and less than 30 days past due
Loan delinquency information
Total Loans Carrying Value	936	538
Originated Residential Agency loans \| 30-59 Days Past Due
Loan delinquency information
Total Loans Carrying Value		654
Originated Residential Agency loans \| 60+ Days Past Due
Loan delinquency information
Total Loans Carrying Value	$ 2,202	$ 2,016

General allowance for loan losses assessed on a collective basis included in the total allowance for loan losses.

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