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Non-consolidated VIEs - Corporation's VI in non-consolidated VIEs and max exposure to loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Variable Interest Entity      
Assets $ 69,525,082 $ 75,097,899 $ 66,870,268
Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entity      
Assets 105,000 102,432  
Maximum exposure to loss 105,000 102,432  
Variable Interest Entity Not Primary Beneficiary | Servicing assets      
Variable Interest Entity      
Assets 97,717 94,464  
Variable Interest Entity Not Primary Beneficiary | Mortgage servicing rights      
Variable Interest Entity      
Assets 97,717 94,464  
Variable Interest Entity Not Primary Beneficiary | Other assets      
Variable Interest Entity      
Assets 7,283 7,968  
Variable Interest Entity Not Primary Beneficiary | Servicing advances      
Variable Interest Entity      
Assets $ 7,283 $ 7,968