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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 1,663,711 | $ 833,596 |  |
Loans held-for-sale | 870,444 | 672,850 |  |
Derivative assets | 12,288 | 9,042 |  |
Mortgage servicing rights, at fair value | 48,370 | 49,939 | $ 21,165 | $ 19,082
Derivative liabilities | 6,543 | 1,067 |  |
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 | 1,663,711 | 833,596 |  |
Loans held-for-sale | 843,864 | 654,559 |  |
Derivative assets | 12,288 | 9,042 |  |
Derivative liabilities | 6,543 | 1,067 |  |
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 | 26,580 | 18,291 |  |
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 | 1,663,711 | 833,596 |  |
Loans held-for-sale | 863,944 | 668,841 |  |
Derivative assets | 12,288 | 9,042 |  |
Derivative liabilities | 6,543 | 1,067 |  |
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 |  |
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 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Servicing Asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 0 | 0 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Accrued Expenses and Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative liabilities | 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 | 408,076 | 360,864 |  |
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 | 1,408 | 1,504 |  |
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 | 1,595 | 1,768 |  |
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 | 26,177 | 26,152 |  |
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 | 966,321 | 111,468 |  |
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 | 668,210 | 692,704 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 12,288 | 9,042 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Servicing Asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 0 | 0 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Accrued Expenses and Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative liabilities | 6,543 | 1,067 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 26,580 | 18,291 |  |
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 | Significant Unobservable Inputs (Level 3) | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Servicing Asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 48,370 | 49,939 |  |
Recurring | Significant Unobservable Inputs (Level 3) | Accrued Expenses and Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative liabilities | 0 | 0 |  |
Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 434,656 | 379,155 |  |
Recurring | Carrying Value | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,408 | 1,504 |  |
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 | 1,595 | 1,768 |  |
Recurring | Carrying Value | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 26,177 | 26,152 |  |
Recurring | Carrying Value | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 966,321 | 111,468 |  |
Recurring | Carrying Value | Agency mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 668,210 | 692,704 |  |
Recurring | Carrying Value | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 12,288 | 9,042 |  |
Recurring | Carrying Value | Servicing Asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 48,370 | 49,939 |  |
Recurring | Carrying Value | Accrued Expenses and Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative liabilities | $ 6,543 | $ 1,067 |  |

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