Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Variable Interest Entities (VIEs)
Total Assets	$ 11,086,055	$ 11,278,638	$ 9,881,532
Total Liabilities	9,857,516	10,123,229
Single Family and Multi-Family Debt Financing Investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities (VIEs)
Total Assets	39,898	36,573
Total Liabilities	14,823	21,014
Maximum Exposure to Loss	$ 38,414	$ 36,164