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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 15 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
MSRs sold |  | $ 2,570 | $ 0 | $ 28,549 | $ 39,186 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Servicing rights carried at fair value |  |  | 0 |  | 0 |  |  | $ 37,700 |  |
MSRs sold | $ 37,800 | 0 | 0 | 0 | 37,772 | $ 37,772 |  |  |  |
Loans held-for-sale, carried at fair value |  | 26,415 |  | 26,415 |  | 26,415 |  | 38,696 |  |
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 4,953 | 42,833 | 31,852 | 76,121 |  |  |  |  |
Transfers in and (out) of Level 3 |  | 0 | 0 | 0 | 0 |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | (216) | (3,035) | (1,090) | (3,079) |  |  |  |  |
Additions |  | 0 | 3,751 | 0 | 11,552 |  |  |  |  |
Sales, paydowns, settlements, and other |  | (2,675) | (1,440) | (28,700) | (42,485) |  |  |  |  |
Balance at end of period |  | 2,062 | 42,109 | 2,062 | 42,109 | 2,062 |  |  |  |
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 |  | 42,962 | 66,701 | 98,940 | 58,260 |  |  |  |  |
Transfers in and (out) of Level 3 |  | 0 | 0 | 0 | 0 |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | (248) | 6 | (254) | 15 |  |  |  |  |
Additions |  | 2,765 | 17,935 | 27,385 | 35,231 |  |  |  |  |
Sales, paydowns, settlements, and other |  | (12,245) | (11,097) | (92,837) | (19,961) |  |  |  |  |
Balance at end of period |  | 33,234 | 73,545 | 33,234 | 73,545 | 33,234 |  |  |  |
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 |  | $ 20,900 | $ 52,100 | $ 20,900 | $ 52,100 | $ 20,900 | $ 24,000 | $ 32,300 | $ 66,700 | $ 58,300

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