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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Discontinued Operations (Details) - Agency debentures - Single family $ in Billions | Dec. 31, 2019 USD ($) saleOfRight | Mar. 31, 2019 USD ($) saleOfRight
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Mortgage servicing rights, unpaid principle balance, sold, number of sales | saleOfRight | 2 | 2
Mortgage servicing rights, unpaid principal balance, sold | $ | $ 14.3 | $ 14.3

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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. + References No definition available. + Details
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- Details
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- Details
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