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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Loans held-for-sale, carried at fair value |  |  |  |  |  | $ 19,500,000 |  |
Significant Unobservable Inputs (Level 3) | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |  |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Loans held-for-sale, carried at fair value |  |  |  |  |  | 17,400,000 |  |
Significant Unobservable Inputs (Level 3) | 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 | $ 23,069,000 | $ 42,962,000 | $ 25,040,000 | $ 98,940,000 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment | (6,000) | (248,000) | (3,000) | (254,000) |  |  |  |
Additions | 0 | 2,765,000 | 0 | 27,385,000 |  |  |  |
Sales, paydowns, settlements, and other | (1,988,000) | (12,245,000) | (3,962,000) | (92,837,000) |  |  |  |
Balance at end of period | 21,075,000 | 33,234,000 | 21,075,000 | 33,234,000 |  |  |  |
Significant Unobservable Inputs (Level 3) | 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 | $ 0 | $ 20,900,000 | $ 0 | $ 20,900,000 | $ 0 | $ 17,300,000 | $ 24,000,000.0 | $ 32,300,000

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