Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Variable Interest Entities (VIEs)
Total Assets	$ 14,240,966	$ 12,615,227	$ 9,650,592
Total Liabilities	12,735,282	11,155,488
Maximum Exposure to Loss	867,100	871,800
Single Family and Multi-Family Debt Financing Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities (VIEs)
Total Assets	60,466	52,125
Total Liabilities	25,207	25,564
Maximum Exposure to Loss	$ 60,466	$ 52,125