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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
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

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- Definition

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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.

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