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FAIR VALUES OF FINANCIAL INSTRUMENTS - Gains and (Losses) on Non-Recurring Assets (Details) - Nonrecurring - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired loans | Single family residential mortgage |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and (losses) recognized on assets measured at fair value | $ (164) | $ 0 | $ 0
Impaired loans | SBA |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and (losses) recognized on assets measured at fair value | (200) | 0 | 4
Impaired loans | Other consumer |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and (losses) recognized on assets measured at fair value | (29) | 0 | 0
Other real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and (losses) recognized on assets measured at fair value | $ (284) | $ (235) | $ (15)

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