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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
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 149,762 $ 174,268
Maximum exposure to loss 149,762 174,268
Servicing assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 116,206 136,280
Mortgage servicing rights    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 116,206 136,280
Other assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 33,556 37,988
Servicing advances    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 33,556 $ 37,988