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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total gains or losses (realized/unrealized): |  |  |  |  |
MSRs sold |  | $ 39,345 | $ 5,382 | $ 5,862 |
Mortgage Servicing Rights |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance |  | 76,121 | 49,939 | 19,082 |
Transfers in (out of) Level 3 |  | 0 | 0 | 0 |
Total gains or losses (realized/unrealized): |  |  |  |  |
Included in earnings-fair value adjustment |  | (10,240) | (5,709) | (3,568) |
Additions |  | 12,127 | 49,293 | 45,263 |
Sales and settlements |  | (46,156) | (17,402) | (10,838) |
Ending Balance |  | 31,852 | 76,121 | 49,939 |
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 |  | 58,260 | 18,291 | 0 |
Transfers in (out of) Level 3 |  | 0 | 0 | 1,088 |
Total gains or losses (realized/unrealized): |  |  |  |  |
Included in earnings-fair value adjustment |  | (781) | 216 | 0 |
Additions |  | 117,215 | 51,123 | 18,555 |
Sales and settlements |  | (75,754) | (11,370) | (1,352) |
Ending Balance |  | 98,940 | 58,260 | 18,291 |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |
Servicing rights carried at fair value |  | 0 | 37,681 | 22,900 | $ 10,700
MSRs sold | $ 37,800 | 37,772 |  |  |
Loans held-for-sale, carried at fair value |  | 38,696 | 406,338 |  |
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 |  | $ 32,300 | $ 58,300 | $ 18,300 | $ 0

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