Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entities (VIEs)
Total Assets	$ 12,615,227	$ 11,278,638	$ 9,645,375
Total Liabilities	11,155,488	10,123,229
Maximum Exposure to Loss	871,800
Single Family and Multi-Family Debt Financing Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities (VIEs)
Total Assets	52,125	36,573
Total Liabilities	25,564	21,014
Maximum Exposure to Loss	$ 52,125	$ 36,164