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Note Non-consolidated VIEs (Carrying amount and classification of assets related to the Corporation's VI in non-consolidated VIEs and max exposure to loss) (Detail) - FNMA, GNMA, FHLMC VIE - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 174,268 $ 180,434
Maximum exposure to loss 174,268 180,434
Servicing assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 136,280 132,692
Mortgage servicing rights    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 136,280 132,692
Other assets    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets 37,988 47,742
Servicing advances    
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net    
Assets $ 37,988 $ 47,742