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FAIR VALUES OF FINANCIAL INSTRUMENTS - Recurring Basis (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 1,992,500,000 | $ 2,575,469,000 |  |
Mortgage servicing rights | 1,770,000 | 31,852,000 | $ 76,121,000 | $ 49,939,000
Derivative assets | 1,534,000 | 1,005,000 |  |
Derivative liabilities | 1,600,000 | 1,033,000 |  |
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 |  |
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 | 1,992,500,000 | 2,575,469,000 |  |
Derivative assets | 1,534,000 | 1,005,000 |  |
Derivative liabilities | 1,600,000 | 1,033,000 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Mortgage servicing rights | 1,704,000 | 2,059,000 |  |
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 | 1,992,500,000 | 2,575,469,000 |  |
Derivative assets | 1,534,000 | 1,005,000 |  |
Derivative liabilities | 1,600,000 | 1,033,000 |  |
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, carried at fair value | 0 | 0 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights, including discontinued operations |  | 0 |  |
Derivative assets | 0 |  |  |
Derivative liabilities | 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 | 2,140,000 | 6,359,000 |  |
Mortgage servicing rights | 0 |  |  |
Mortgage servicing rights, including discontinued operations |  | 0 |  |
Derivative assets | 1,534,000 |  |  |
Derivative liabilities | 1,600,000 |  |  |
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 | 25,040,000 | 98,940,000 |  |
Mortgage servicing rights | 1,770,000 |  |  |
Mortgage servicing rights, including discontinued operations |  | 31,852,000 |  |
Derivative assets | 0 |  |  |
Derivative liabilities | 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 | 27,180,000 | 105,299,000 |  |
Mortgage servicing rights | 1,770,000 |  |  |
Mortgage servicing rights, including discontinued operations |  | 31,852,000 |  |
Derivative assets | 1,534,000 |  |  |
Derivative liabilities | 1,600,000 |  |  |
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 | 19,490,000 | 38,696,000 |  |
Servicing rights carried at fair value | 0 | 0 | $ 37,700,000 | $ 22,900,000
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 | 2,100,000 | 6,400,000 |  |
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 | 17,400,000 | 32,300,000 |  |
SBA loan pool securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 910,000 | 1,058,000 |  |
SBA loan pool securities | Recurring | 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 |  |
SBA loan pool securities | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 910,000 | 1,058,000 |  |
SBA loan pool securities | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
SBA loan pool securities | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 910,000 | 1,058,000 |  |
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 437,442,000 | 476,929,000 |  |
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools | Recurring | 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 Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 437,442,000 | 476,929,000 |  |
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools | Recurring | 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 Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 437,442,000 | 476,929,000 |  |
Non-agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 427,000 | 756,000 |  |
Non-agency residential mortgage-backed securities | Recurring | 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 |  |
Non-agency residential mortgage-backed securities | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 427,000 | 756,000 |  |
Non-agency residential mortgage-backed securities | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Non-agency residential mortgage-backed securities | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 427,000 | 756,000 |  |
Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 132,199,000 | 310,511,000 |  |
Non-agency commercial mortgage-backed securities | Recurring | 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 |  |
Non-agency commercial mortgage-backed securities | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 132,199,000 | 310,511,000 |  |
Non-agency commercial mortgage-backed securities | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Non-agency commercial mortgage-backed securities | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 132,199,000 | 310,511,000 |  |
Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,421,522,000 | 1,702,318,000 |  |
Collateralized loan obligations | Recurring | 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 |  |
Collateralized loan obligations | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 1,421,522,000 | 1,702,318,000 |  |
Collateralized loan obligations | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | 0 | 0 |  |
Collateralized loan obligations | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities | $ 1,421,522,000 | 1,702,318,000 |  |
Corporate debt securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 83,897,000 |  |
Corporate debt securities | Recurring | 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 |  |
Corporate debt securities | Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 83,897,000 |  |
Corporate debt securities | Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 0 |  |
Corporate debt securities | Recurring | Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities |  | 83,897,000 |  |
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 |  | 1,005,000 |  |
Derivative liabilities |  | 1,033,000 |  |
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 |  | 1,005,000 |  |
Derivative liabilities |  | $ 1,033,000 |  |

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