Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Variable Interest Entities (VIEs)
Total Assets	$ 11,978,722	$ 11,278,638	$ 10,952,033
Total Liabilities	10,566,132	10,123,229
Maximum Exposure to Loss	1,000,000
Single Family and Multi-Family Debt Financing Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities (VIEs)
Total Assets	56,289	36,573
Total Liabilities	30,660	21,014
Maximum Exposure to Loss	$ 55,014	$ 36,164