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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 2,575,469 | $ 2,381,488 |  |
Mortgage servicing rights | 31,852 | 76,121 | $ 49,939 | $ 19,082
Derivative assets | 1,005 | 17,968 |  |
Derivative liabilities | 1,033 | 2,116 |  |
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 |  |
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 | 2,575,469 | 2,381,488 |  |
Derivative assets | 1,005 | 17,968 |  |
Derivative liabilities | 1,033 | 2,116 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Mortgage servicing rights | 2,059 | 76,121 |  |
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 | 2,575,469 | 2,381,488 |  |
Derivative assets | 1,005 | 17,968 |  |
Derivative liabilities | 1,033 | 2,116 |  |
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, carried at fair value | 0 | 0 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights, including discontinued operations |  | 0 |  |
Derivative assets | 0 |  |  |
Derivative liabilities | 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 agency and U.S. government sponsored enterprise 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) | Non-agency 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) | Non-agency commercial mortgage-backed 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) | 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) | Corporate debt 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, carried at fair value | 6,359 | 358,714 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights, including discontinued operations |  | 0 |  |
Derivative assets | 1,005 |  |  |
Derivative liabilities | 1,033 |  |  |
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 | 1,058 | 1,221 |  |
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 476,929 | 807,273 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 756 | 117,177 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 310,511 |  |  |
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 | 1,702,318 | 1,406,869 |  |
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 83,897 | 48,948 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 98,940 | 58,260 |  |
Mortgage servicing rights | 31,852 |  |  |
Mortgage servicing rights, including discontinued operations |  | 76,121 |  |
Derivative assets | 0 |  |  |
Derivative liabilities | 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 agency and U.S. government sponsored enterprise 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) | Non-agency 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) | Non-agency commercial mortgage-backed 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) | 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) | Corporate debt 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, carried at fair value | 105,299 | 416,974 |  |
Mortgage servicing rights | 31,852 |  |  |
Mortgage servicing rights, including discontinued operations |  | 76,121 |  |
Derivative assets | 1,005 |  |  |
Derivative liabilities | 1,033 |  |  |
Recurring | Carrying Value | SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,058 | 1,221 |  |
Recurring | Carrying Value | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 476,929 | 807,273 |  |
Recurring | Carrying Value | Non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 756 | 117,177 |  |
Recurring | Carrying Value | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 310,511 |  |  |
Recurring | Carrying Value | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,702,318 | 1,406,869 |  |
Recurring | Carrying Value | Corporate debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 83,897 | 48,948 |  |
Interest rate lock commitments | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 0 |  |
Derivative liabilities, held in discontinued operations |  | 0 |  |
Interest rate lock commitments | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 8,317 |  |
Derivative liabilities, held in discontinued operations |  | 231 |  |
Interest rate lock commitments | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 0 |  |
Derivative liabilities, held in discontinued operations |  | 0 |  |
Interest rate lock commitments | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 8,317 |  |
Derivative liabilities, held in discontinued operations |  | 231 |  |
Mandatory forward commitments | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 0 |  |
Derivative liabilities, held in discontinued operations |  | 0 |  |
Mandatory forward commitments | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 8,897 |  |
Derivative liabilities, held in discontinued operations |  | 1,212 |  |
Mandatory forward commitments | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 0 |  |
Derivative liabilities, held in discontinued operations |  | 0 |  |
Mandatory forward commitments | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets, held in discontinued operations |  | 8,897 |  |
Derivative liabilities, held in discontinued operations |  | 1,212 |  |
Interest rate swaps on deposits and other borrowings | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 |  |
Derivative liabilities |  | 0 |  |
Interest rate swaps on deposits and other borrowings | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 707 |  |
Derivative liabilities |  | 655 |  |
Interest rate swaps on deposits and other borrowings | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 |  |
Derivative liabilities |  | 0 |  |
Interest rate swaps on deposits and other borrowings | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 707 |  |
Derivative liabilities |  | 655 |  |
Foreign exchange contracts | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 |  |
Derivative liabilities |  | 0 |  |
Foreign exchange contracts | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 47 |  |
Derivative liabilities |  | 18 |  |
Foreign exchange contracts | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 |  |
Derivative liabilities |  | 0 |  |
Foreign exchange contracts | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 47 |  |
Derivative liabilities |  | 18 |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 38,696 | 406,338 |  |
Servicing rights carried at fair value | 0 | 37,681 | $ 22,900 | $ 10,700
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | 6,400 | 348,100 |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loans held-for-sale, carried at fair value | $ 32,300 | $ 58,300 |  |

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