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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 2,434,541,000 | $ 2,381,488,000 |  |
Loans held-for-sale | 653,422,000 | 711,188,000 |  |
Mortgage servicing rights including discontinued operations | 42,833,000 | 76,121,000 | $ 48,370,000 | $ 49,939,000
Derivative assets | 11,065,000 | 17,968,000 |  |
Derivative liabilities | 4,086,000 | 2,116,000 |  |
Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 420,449,000 | 406,338,000 |  |
MSRs sold | 0 | 37,681,000 | $ 22,300,000 | $ 23,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Loans held-for-sale | 0 | 0 |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,434,541,000 | 2,381,488,000 |  |
Loans held-for-sale | 586,721,000 | 652,928,000 |  |
Derivative assets | 11,065,000 | 17,968,000 |  |
Derivative liabilities | 4,086,000 | 2,116,000 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Loans held-for-sale | 66,701,000 | 58,260,000 |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 2,434,541,000 | 2,381,488,000 |  |
Loans held-for-sale | 649,327,000 | 704,651,000 |  |
Derivative assets | 11,065,000 | 17,968,000 |  |
Derivative liabilities | 4,086,000 | 2,116,000 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 0 | 0 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights including discontinued operations |  | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 0 | 0 |  |
Derivative liabilities held in discontinued operations | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mandatory forward commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 0 | 0 |  |
Derivative liabilities held in discontinued operations | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps on deposits and other borrowings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 355,443,000 | 358,714,000 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights including discontinued operations |  | 0 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 353,748,000 | 348,078,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 9,813,000 | 8,317,000 |  |
Derivative liabilities held in discontinued operations | 81,000 | 231,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Mandatory forward commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 153,000 | 8,897,000 |  |
Derivative liabilities held in discontinued operations | 2,909,000 | 1,212,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on deposits and other borrowings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 1,099,000 | 707,000 |  |
Derivative liabilities | 1,096,000 | 655,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 47,000 |  |
Derivative liabilities | 0 | 18,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,145,000 | 1,221,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Private label residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 116,757,000 | 117,177,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 19,144,000 | 48,948,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,502,253,000 | 1,406,869,000 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 795,242,000 | 807,273,000 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 66,701,000 | 58,260,000 |  |
Mortgage servicing rights | 42,833,000 |  |  |
Mortgage servicing rights including discontinued operations |  | 76,121,000 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Discontinued Operations, Disposed of by Sale | Banc Home Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 66,701,000 | 58,260,000 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 0 | 0 |  |
Derivative liabilities held in discontinued operations | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Mandatory forward commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 0 | 0 |  |
Derivative liabilities held in discontinued operations | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps on deposits and other borrowings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Private label residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Agency mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 422,144,000 | 416,974,000 |  |
Mortgage servicing rights | 42,833,000 |  |  |
Mortgage servicing rights including discontinued operations |  | 76,121,000 |  |
Recurring | Carrying Value | Interest rate lock commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 9,813,000 | 8,317,000 |  |
Derivative liabilities held in discontinued operations | 81,000 | 231,000 |  |
Recurring | Carrying Value | Mandatory forward commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets held in discontinued operations | 153,000 | 8,897,000 |  |
Derivative liabilities held in discontinued operations | 2,909,000 | 1,212,000 |  |
Recurring | Carrying Value | Interest rate swaps on deposits and other borrowings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 1,099,000 | 707,000 |  |
Derivative liabilities | 1,096,000 | 655,000 |  |
Recurring | Carrying Value | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 47,000 |  |
Derivative liabilities | 0 | 18,000 |  |
Recurring | Carrying Value | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,145,000 | 1,221,000 |  |
Recurring | Carrying Value | Private label residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 116,757,000 | 117,177,000 |  |
Recurring | Carrying Value | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 19,144,000 | 48,948,000 |  |
Recurring | Carrying Value | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,502,253,000 | 1,406,869,000 |  |
Recurring | Carrying Value | Agency mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 795,242,000 | $ 807,273,000 |  |

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