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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 09, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized |  | 500,000 |  | 500,000 |  | 500,000
Shares issued and sold |  | 17,250 |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 10.00 |  | $ 10.00 |  |
Preferred stock, shares outstanding |  | 17,250 |  | 17,250 |  | 0
Net proceeds from issuance of preferred stock |  |  |  | $ 166,363 | $ 0 |
Reclassifications of unrealized gains (losses) on AFS |  | $ 10,339 | $ 51 | $ 12,275 | $ 202 |
Depositary Shares |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Shares issued and sold | 6,900,000 |  |  |  |  |
Number of shares to be purchased upon the exercise of options | 900,000 |  |  |  |  |
Preferred stock, liquidation preference (usd per share) | $ 25 |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Number of preferred stock represented by each depositary share | The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock |  |  |  |  |
Preferred stock, liquidation preference (usd per share) | $ 10,000 |  |  |  |  |
Net proceeds from issuance of preferred stock | $ 166,400 |  |  |  |  |

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