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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended | 21 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2014
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
MSRs sold |  | $ 28,500,000 | $ 28,549,000 | $ 39,345,000 | $ 5,382,000 |  |  |
Mortgage Servicing Rights |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  | 31,852,000 | 31,852,000 | 76,121,000 | 49,939,000 |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Included in earnings-fair value adjustment |  |  | (1,155,000) | (10,240,000) | (5,709,000) |  |  |
Additions |  |  | 0 | 12,127,000 | 49,293,000 |  |  |
Sales and settlements |  |  | (28,927,000) | (46,156,000) | (17,402,000) |  |  |
Ending Balance |  |  | 1,770,000 | 31,852,000 | 76,121,000 | $ 1,770,000 |  |
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  | $ 98,940,000 | 98,940,000 | 58,260,000 | 18,291,000 |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Included in earnings-fair value adjustment |  |  | (1,378,000) | (781,000) | 216,000 |  |  |
Additions |  |  | 23,678,000 | 117,215,000 | 51,123,000 |  |  |
Sales and settlements |  |  | (96,200,000) | (75,754,000) | (11,370,000) |  |  |
Ending Balance |  |  | 25,040,000 | 98,940,000 | 58,260,000 | 25,040,000 |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Servicing rights carried at fair value |  |  | 0 | 0 | 37,700,000 | 0 | $ 22,900,000 |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
MSRs sold | $ 37,800,000 |  | 28,500,000 | 37,772,000 |  | 37,772,000 |  |
Loans held-for-sale, carried at fair value |  |  | 19,490,000 | 38,696,000 |  | 19,490,000 |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan | Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Loans held-for-sale, carried at fair value |  |  | $ 17,300,000 | $ 32,300,000 | $ 58,300,000 | $ 17,300,000 |  | $ 18,300,000

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