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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | $ 2,755,664 |  | $ 2,381,488 |  |  |
Loans held-for-sale | 109,756 |  | 711,188 |  |  |
Mortgage servicing rights including discontinued operations | 38,715 | $ 42,109 | 76,121 | $ 62,676 | $ 52,567 | $ 49,939
Derivative assets | 1,112 |  | 17,968 |  |  |
Derivative liabilities | 1,146 |  | 2,116 |  |  |
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 | 58,954 |  | 406,338 |  |  |
MSRs sold | 0 | $ 0 | 37,681 | $ 30,800 | $ 24,400 | $ 23,000
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 | 2,755,664 |  | 2,381,488 |  |  |
Loans held-for-sale | 25,392 |  | 652,928 |  |  |
Derivative assets | 1,112 |  | 17,968 |  |  |
Derivative liabilities | 1,146 |  | 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 |  |  |
Loans held-for-sale | 84,364 |  | 58,260 |  |  |
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 | 2,755,664 |  | 2,381,488 |  |  |
Loans held-for-sale | 109,084 |  | 704,651 |  |  |
Derivative assets | 1,112 |  | 17,968 |  |  |
Derivative liabilities | 1,146 |  | 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 | 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 |  |  |
Derivative liabilities held in discontinued operations |  |  | 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 |  |  |
Derivative liabilities held in discontinued operations |  |  | 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 |  |  |
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 | 17,778 |  | 358,714 |  |  |
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 | 17,800 |  | 348,100 |  |  |
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 |  |  | 8,317 |  |  |
Derivative liabilities held in discontinued operations |  |  | 231 |  |  |
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 |  |  | 8,897 |  |  |
Derivative liabilities held in discontinued operations |  |  | 1,212 |  |  |
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 | 1,112 |  | 707 |  |  |
Derivative liabilities | 1,146 |  | 655 |  |  |
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 |  |  | 47 |  |  |
Derivative liabilities |  |  | 18 |  |  |
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 | 1,065 |  | 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 | 489,117 |  | 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 | 859 |  | 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 | 310,917 |  |  |  |  |
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 | 1,819,191 |  | 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 | 134,515 |  | 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 | 84,364 |  | 58,260 |  |  |
Mortgage servicing rights | 38,715 |  |  |  |  |
Mortgage servicing rights including discontinued operations |  |  | 76,121 |  |  |
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 | 41,200 |  | 58,300 |  |  |
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 |  |  |
Derivative liabilities held in discontinued operations |  |  | 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 |  |  |
Derivative liabilities held in discontinued operations |  |  | 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 |  |  |
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 | 102,142 |  | 416,974 |  |  |
Mortgage servicing rights | 38,715 |  |  |  |  |
Mortgage servicing rights including discontinued operations |  |  | 76,121 |  |  |
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 |  |  | 8,317 |  |  |
Derivative liabilities held in discontinued operations |  |  | 231 |  |  |
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 |  |  | 8,897 |  |  |
Derivative liabilities held in discontinued operations |  |  | 1,212 |  |  |
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 | 1,112 |  | 707 |  |  |
Derivative liabilities | 1,146 |  | 655 |  |  |
Recurring | Carrying Value | Foreign exchange contracts |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets |  |  | 47 |  |  |
Derivative liabilities |  |  | 18 |  |  |
Recurring | Carrying Value | SBA loan pool securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 1,065 |  | 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 | 489,117 |  | 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 | 859 |  | 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 | 310,917 |  |  |  |  |
Recurring | Carrying Value | Collateralized loan obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 1,819,191 |  | 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 | $ 134,515 |  | $ 48,948 |  |  |

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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