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 | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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| 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 |
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- Definition The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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