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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 833,596 | $ 345,695 |  |
Loans held-for-sale | 672,850 | 1,195,834 |  |
Derivative assets | 9,042 | 6,379 |  |
Mortgage servicing rights, at fair value | 49,939 | 19,082 | $ 13,535 | $ 1,739
Derivative liabilities | 1,067 | 3,235 |  |
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 | 833,596 | 345,695 |  |
Loans held-for-sale | 654,559 | 1,195,834 |  |
Derivative assets | 9,042 | 6,379 |  |
Derivative liabilities | 1,067 | 3,235 |  |
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 | 18,291 | 0 |  |
Derivative assets | 0 | 0 |  |
Mortgage servicing rights, at fair value | 49,939 | 13,135 |  |
Derivative liabilities | 0 | 0 |  |
Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 833,596 | 345,695 |  |
Loans held-for-sale | 668,841 | 1,187,090 |  |
Derivative assets | 9,042 | 6,379 |  |
Derivative liabilities | 1,067 | 3,235 |  |
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) | 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 Assets, Net |  |  |  |
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 | 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) | U.S. government-sponsored entities and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 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 |  |  |
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 |  |  |
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 | 360,864 | 278,749 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 9,042 | 6,379 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Servicing Assets, Net |  |  |  |
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 | 1,067 | 3,235 |  |
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 | 1,504 | 1,715 |  |
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government-sponsored entities and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 1,982 |  |
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 | 1,768 | 3,168 |  |
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 | 26,152 |  |  |
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 | 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 | 692,704 | 338,830 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale | 18,291 | 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 Assets, Net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 49,939 | 19,082 |  |
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 | 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) | U.S. government-sponsored entities and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 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 |  |  |
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 |  |  |
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 | 379,155 | 278,749 |  |
Recurring | Carrying Value | Other Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 9,042 | 6,379 |  |
Recurring | Carrying Value | Servicing Assets, Net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights, at fair value | 49,939 | 19,082 |  |
Recurring | Carrying Value | Accrued Expenses and Other Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative liabilities | 1,067 | 3,235 |  |
Recurring | Carrying Value | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,504 | 1,715 |  |
Recurring | Carrying Value | U.S. government-sponsored entities and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 1,982 |  |
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 | 1,768 | 3,168 |  |
Recurring | Carrying Value | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 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 | 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 | $ 692,704 | $ 338,830 |  |

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