Secured Borrowings - Schedule of Carrying Value of Collateral Pledged with Respect to Secured Borrowings Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Secured borrowings
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	$ 3,656,551	$ 4,012,250
Total borrowings under credit facilities and other financing agreements \| Loans and finance receivables
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	446,514	451,667
Total borrowings under credit facilities and other financing agreements \| Loans, held for sale \| Loans and finance receivables
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	25,941	28,516
Total borrowings under credit facilities and other financing agreements \| Loans, net \| Loans and finance receivables
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	420,573	423,151
Total borrowings under repurchase agreements \| Securities sold under agreements to repurchase
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	3,210,037	3,560,583
Total borrowings under repurchase agreements \| Securities sold under agreements to repurchase \| Real estate acquired in settlement of loans
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	516,333	546,835
Total borrowings under repurchase agreements \| Loans, held for sale \| Securities sold under agreements to repurchase
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	272,230	506,883
Total borrowings under repurchase agreements \| Loans, net \| Securities sold under agreements to repurchase
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	2,208,675	2,284,251
Total borrowings under repurchase agreements \| MBS \| Securities sold under agreements to repurchase
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	31,648	34,501
Total borrowings under repurchase agreements \| Retained Interest \| Securities sold under agreements to repurchase
Line of Credit Facility [Line Items]
Carrying value, Pledged assets	$ 181,151	$ 188,113