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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
(Decrease) increase in GNMA loans subject to a repurchase option | $ (66,000) |  |
Servicing rights, held-for-sale, fair value | 66 | $ 29,800 |
Net gains (losses) attributable to instrument-specific credit risk | 0 | 0 | $ 0
Net change in valuation allowance | 53 | 236 | $ 31
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] |  |  |
Aggregated unpaid principal balances | $ 25,500 | 99,700 |
Insured Servicing Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Expected loss rate | 1.55% |  |
Uninsured Servicing Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Expected loss rate | 20.00% |  |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held for sale |  | 66,000 |
Third Party Provider's Valuation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing rights, held-for-sale, fair value | $ 1,700 | 2,100 |
Adjusted market bid valuation | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing rights, held-for-sale, fair value | $ 66 | $ 29,800 |

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- Definition This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Valuation adjustments made to other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
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