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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 | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 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 | $ 21,075,000 | $ 33,234,000 | $ 25,040,000 | $ 98,940,000 |  |  |  |
Total gains or losses (realized/unrealized): |  |  |  |  |  |  |  |
Included in earnings—fair value adjustment | 2,000 | (22,000) | (1,000) | (276,000) |  |  |  |
Additions | 406,000 | 711,000 | 406,000 | 28,096,000 |  |  |  |
Sales, paydowns, settlements, and other | (978,000) | (8,167,000) | (4,940,000) | (101,004,000) |  |  |  |
Balance at end of period | 20,505,000 | 25,756,000 | 20,505,000 | 25,756,000 |  |  |  |
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 | $ 17,700,000 | $ 0 | $ 17,700,000 | $ 0 | $ 17,300,000 | $ 20,900,000 | $ 32,300,000

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