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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Banc Home Loans Sale Additional Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
MSRs sold |  |  | $ 39,345 | $ 5,382 | $ 5,862
Net gain on disposal |  |  | 13,796 | 0 | 0
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 |  |  |  |
Book value of certain assets sold | 2,500 | $ 2,455 | 2,455 |  |
Income from earn-out |  | $ 1,100 |  |  |
MSRs sold | 37,800 |  | 37,772 |  |
Net gain on disposal | 13,800 |  | $ 13,796 | $ 0 | $ 0
Buyout Option, Future Earn-Out Receivable | Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contingent consideration | 35,000 |  |  |  |
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 |  |  |  |

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