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Variable interest entities and securitization activities - Assets of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Carrying amount    
Mortgage backed securities, at fair value $ 37,895 $ 99,496
Investment in unconsolidated joint ventures (including $8,268 and $8,894 held at fair value) 119,272 141,148
Total Assets 11,858,211 9,534,031
Unconsolidated VIEs    
Carrying amount    
Mortgage backed securities, at fair value 24,344 80,756
Investment in unconsolidated joint ventures (including $8,268 and $8,894 held at fair value) 112,776 74,334
Total Assets 137,120 155,090
Maximum Exposure to Loss    
Mortgage backed securities, at fair value 24,344 80,756
Investment in unconsolidated joint venture 112,776 74,334
Total assets in unconsolidated VIEs maximum exposure to loss $ 137,120 $ 155,090