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Non-consolidated VIEs - Corporation's VI in non-consolidated VIEs and max exposure to loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Variable Interest Entity      
Assets $ 72,657,293 $ 65,926,000 $ 62,845,352
Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entity      
Assets 102,783 99,042  
Maximum exposure to loss 102,783 99,042  
Variable Interest Entity Not Primary Beneficiary | Servicing assets      
Variable Interest Entity      
Assets 93,391 90,273  
Variable Interest Entity Not Primary Beneficiary | Mortgage servicing rights      
Variable Interest Entity      
Assets 93,391 90,273  
Variable Interest Entity Not Primary Beneficiary | Other assets      
Variable Interest Entity      
Assets 9,392 8,769  
Variable Interest Entity Not Primary Beneficiary | Servicing advances      
Variable Interest Entity      
Assets $ 9,392 $ 8,769