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Non-consolidated VIEs - Corporation's VI in non-consolidated VIEs and max exposure to loss (Details) - FNMA, GNMA, FHLMC VIE - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 103,736 $ 144,930
Maximum exposure to loss 103,736 144,930
Servicing assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 93,230 115,718
Mortgage servicing rights    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 93,230 115,718
Other assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 10,506 29,212
Servicing advances    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 10,506 $ 29,212