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SALE OF BUSINESS UNIT (DISCONTINUED OPERATIONS) - Banc Home Loans Sale Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
MSRs sold |  | $ 0 | $ 0 | $ 28,549,000 | $ 39,186,000 |  |
Net gain on disposal |  | 0 | 211,000 | 1,275,000 | 13,749,000 |  |
Caliber |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Unpaid balances of conventional agency mortgage loans | $ 3,860,000,000 |  |  |  |  |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash premium payment | 25,000,000 |  |  |  |  |  |
Book value of certain assets sold | 2,500,000 | 0 | 2,455,000 | 0 | 2,455,000 |  |
Income from earn-out |  | 786,000 | 228,000 | 2,200,000 | 228,000 |  | $ 3,300,000
MSRs sold | $ 37,800,000 | 0 | 0 | 0 | 37,772,000 |  | 37,772,000
Net gain on disposal |  | $ 0 | $ 211,000 | 1,275,000 | $ 13,749,000 | $ 15,100,000 | $ 15,071,000
Reversal of accrued liabilities |  |  |  | $ 1,000,000 |  |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Buyout Option, Future Earn-Out Receivable |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Earn-out performance period | 38 months |  |  |  |  |  |
Contingent consideration | $ 35,000,000 |  |  |  |  |  |

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