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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |
MSRs sold |  | $ 0 | $ 0 | $ 28,549,000 | $ 39,186,000 |  |  |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |
Servicing rights carried at fair value |  |  | 37,700,000 |  | 37,700,000 |  |  |  |
MSRs sold | $ 37,800,000 | 0 | 0 | 0 | 37,772,000 | $ 37,772,000 |  |  |
Loans held-for-sale, carried at fair value |  | 20,290,000 |  | 20,290,000 |  |  | $ 38,696,000 |  |
Mortgage servicing rights |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 2,062,000 | 42,109,000 | 31,852,000 | 76,121,000 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | 33,000 | (1,905,000) | (1,057,000) | (4,984,000) |  |  |  |
Additions |  | 0 | 574,000 | 0 | 12,126,000 |  |  |  |
Sales, paydowns, settlements, and other |  | (66,000) | (2,063,000) | (28,766,000) | (44,548,000) |  |  |  |
Balance at end of period |  | 2,029,000 | 38,715,000 | 2,029,000 | 38,715,000 | 2,062,000 |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 33,234,000 | 73,545,000 | 98,940,000 | 58,260,000 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | (22,000) | (809,000) | (276,000) | (794,000) |  |  |  |
Additions |  | 711,000 | 24,537,000 | 28,096,000 | 59,768,000 |  |  |  |
Sales, paydowns, settlements, and other |  | (8,167,000) | (12,909,000) | (101,004,000) | (32,870,000) |  |  |  |
Balance at end of period |  | 25,756,000 | 84,364,000 | 25,756,000 | 84,364,000 | 33,234,000 |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |
Loans held-for-sale, carried at fair value |  | $ 17,700,000 | $ 41,200,000 | $ 17,700,000 | $ 41,200,000 | $ 20,900,000 | $ 32,300,000 | $ 52,100,000 | $ 58,300,000

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