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MORTGAGE BANKING - Sensitivity Analysis (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Minimum |  |
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] |  |
Adverse change in basis points | 0.50% | 0.50%
Maximum |  |
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] |  |
Adverse change in basis points | 1.00% | 1.00%
Prepayment rate |  |
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] |  |
Decline in fair value from a 50 basis point decrease in interest rates | $ 16 | $ 22
Decline in fair value from a 100 basis point decrease in interest rates | 47 | 46
Weighted average discount rate |  |
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] |  |
Decline in fair value from a 50 basis point increase in weighted average discount rate | 5 | 4
Decline in fair value from a 100 basis point increase in weighted average discount rate | $ 9 | $ 8

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- Definition The hypothetical financial impact of a 0.5 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. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 0.5 percent (50 basis points) 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. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 1 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. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 1 percent (100 basis points) 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. + References No definition available. + Details
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