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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, 2025
Dec. 31, 2024
Jun. 30, 2024
Variable Interest Entity [Line Items]      
Assets $ 76,065,090 $ 73,045,383 $ 72,845,072
Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets 85,479 90,468  
Maximum exposure to loss 85,479 90,468  
Variable Interest Entity Not Primary Beneficiary | Servicing assets      
Variable Interest Entity [Line Items]      
Assets 79,881 84,356  
Variable Interest Entity Not Primary Beneficiary | Mortgage servicing rights      
Variable Interest Entity [Line Items]      
Assets 79,881 84,356  
Variable Interest Entity Not Primary Beneficiary | Other assets      
Variable Interest Entity [Line Items]      
Assets 5,598 6,112  
Variable Interest Entity Not Primary Beneficiary | Servicing advances      
Variable Interest Entity [Line Items]      
Assets $ 5,598 $ 6,112