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Non-consolidated VIEs - Corporation's VI in non-consolidated VIEs and max exposure to loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Assets $ 70,758,155 $ 67,637,917 $ 75,097,899
Variable Interest Entity Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Assets 99,290 105,771  
Maximum exposure to loss 99,290 105,771  
Variable Interest Entity Not Primary Beneficiary | Servicing assets      
Variable Interest Entity [Line Items]      
Assets 92,999 99,614  
Variable Interest Entity Not Primary Beneficiary | Mortgage servicing rights      
Variable Interest Entity [Line Items]      
Assets 92,999 99,614  
Variable Interest Entity Not Primary Beneficiary | Other assets      
Variable Interest Entity [Line Items]      
Assets 6,291 6,157  
Variable Interest Entity Not Primary Beneficiary | Servicing advances      
Variable Interest Entity [Line Items]      
Assets $ 6,291 $ 6,157