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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ (490) | $ (115) | $ (164)
Impaired loans | Commercial real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and (losses) recognized on assets measured at fair value | 0 | (1,752) | 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 | (46) | (1,048) | (200)
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 | (88) | (141) | (29)
Single family residential | 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 | $ (104) | $ 229 | $ (284)

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