Annual report pursuant to Section 13 and 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method Assumptions (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method Assumptions (Details) - Residential Mortgage - Sensitivity Analysis Amortization Carrying Method - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Constant prepayment rate (annualized) 9.40% 8.30%
Constant prepayment rate (annualized), Decline in fair value due to 10% adverse change $ 0 $ 0
Constant prepayment rate (annualized), Decline in fair value due to 20% adverse change $ 0 $ 0
Spread over forward interest rate swap rates 9.00% 10.00%
Spread over forward interest rate swap rates, Decline in fair value due to 10% adverse change $ 0 $ 0
Spread over forward interest rate swap rates, Decline in fair value due to 20% adverse change $ 0 $ 0