Related Party Transactions - Financial Information on Whole Loans Purchased from Affiliates (Details) - Affiliates - Loans Purchased from Affiliates $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Residential mortgage loans
Related Party Transaction [Line Items]
Amount of Loans Purchased from Affiliates during the Year | $	$ 567,324	$ 909,442
Number of Loans Purchased from Affiliates during the Year	1,141	1,959
Number of loans purchased from related parties owned and held	845	754
Commercial mortgage loans
Related Party Transaction [Line Items]
Amount of Loans Purchased from Affiliates during the Year | $	$ 0	$ 0
Number of Loans Purchased from Affiliates during the Year	0	0
Number of loans purchased from related parties owned and held	4	5