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DISCONTINUED OPERATIONS - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
branch
Dec. 31, 2019
USD ($)
saleOfRight
Mar. 31, 2019
USD ($)
saleOfRight
Agency debentures | Single family      
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   $ 14,300.0 $ 14,300.0
Gain (loss) in income during period from discontinued operations before income taxes   $ (0.9)  
HLC Based Mortgage Banking Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Home loan centers sold | branch 47