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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 |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Total gains or losses (realized/unrealized): |  |  |  |
MSRs sold | $ 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 | 22,300 | $ 37,681 | $ 23,000
MSRs sold | 37,772 |  |  |
Mortgage servicing rights |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 76,121 | 49,939 |  |
Transfers in and (out) of Level 3 | 0 | 0 |  |
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings—fair value adjustment | (44) | (8,201) |  |
Additions | 7,801 | 8,582 |  |
Sales, paydowns, and other | (41,045) | (1,950) |  |
Balance at end of period | 42,833 | 48,370 |  |
Agency mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 58,260 | 18,291 |  |
Transfers in and (out) of Level 3 | 0 | 0 |  |
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings—fair value adjustment | 9 | 47 |  |
Additions | 17,296 | 9,826 |  |
Sales, paydowns, and other | (8,864) | (1,584) |  |
Balance at end of period | $ 66,701 | $ 26,580 |  |

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