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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 | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
MSRs sold |  | $ 0 |  | $ 0 | $ 39,186 | $ 3 |  |  |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Servicing rights carried at fair value |  | 0 |  | 30,800 | 0 | 30,800 | $ 0 | $ 37,681 | $ 24,400 | $ 23,000
MSRs sold | $ 37,800 |  | $ 37,800 |  | 37,772 |  |  |  |  |
Loans held-for-sale, carried at fair value |  | 58,954 |  |  | 58,954 |  |  | 406,338 |  |
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 42,109 | 76,121 | 52,567 | 76,121 | 49,939 |  |  |  |
Transfers in and (out) of Level 3 |  | 0 |  | 0 | 0 | 0 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | (1,905) |  | (465) | (4,984) | (14,497) |  |  |  |
Additions |  | 574 |  | 14,300 | 12,126 | 35,648 |  |  |  |
Sales, paydowns, settlements, and other |  | (2,063) |  | (3,726) | (44,548) | (8,414) |  |  |  |
Balance at end of period |  | 38,715 |  | 62,676 | 38,715 | 62,676 |  |  |  |
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 |  | 73,545 | $ 58,260 | 34,251 | 58,260 | 18,291 |  |  |  |
Transfers in and (out) of Level 3 |  | 0 |  | 0 | 0 | 0 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment |  | (809) |  | (21) | (794) | 121 |  |  |  |
Additions |  | 24,537 |  | 14,445 | 59,768 | 35,548 |  |  |  |
Sales, paydowns, settlements, and other |  | (12,909) |  | (1,027) | (32,870) | (6,312) |  |  |  |
Balance at end of period |  | 84,364 |  | 47,648 | 84,364 | 47,648 |  |  |  |
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 |  | $ 41,200 |  | $ 47,600 | $ 41,200 | $ 47,600 | $ 52,100 | $ 58,300 | $ 34,300 | $ 18,300

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