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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassifications of unrealized gains (losses) on AFS |  |  | $ 7,675 | $ 383 | $ 800
Accounting Standards Update 2017-12 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassifications of unrealized gains (losses) on AFS | $ 400 |  |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income | $ (107) |  |  |  |
Accounting Standards Update 2016-01 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  | $ (61) |  |  |
Serial Preferred Stock |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  |  | 500,000 |  |
Preferred stock, par value (usd per share) |  |  | $ 10.00 |  |
Preferred stock, shares issued |  |  | 0 | 0 |
Preferred stock, shares outstanding |  |  | 0 | 0 |

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