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STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,924,581 | $ 1,046,329 | $ 1,001,032
Other comprehensive income (loss) | 45,848 | (9,343) | 2,925
Ending balance | 2,513,102 | 1,924,581 | 1,046,329
Unrealized Gains (Losses) on AFS Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (5,949) | 1,874 | (542)
Transfer of HTM securities to AFS securities |  | 2,785 |
Cumulative effects from adoption of new accounting standards |  | 465 |
Other comprehensive income (loss) before reclassification | 49,890 | (10,711) | 2,936
Amounts reclassified from accumulated other comprehensive income | (6,064) | (362) | (520)
Other comprehensive income (loss) | 43,826 | (11,073) | 2,416
Ending balance | 37,877 | (5,949) | 1,874
Unrealized Gains (Losses) for AFS Securities Transferred to HTM |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 95 | 2,705 | 3,377
Transfer of HTM securities to AFS securities |  | (2,785) |
Cumulative effects from adoption of new accounting standards |  | 583 |
Other comprehensive income (loss) before reclassification | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income | (20) | (408) | (672)
Other comprehensive income (loss) | (20) | (408) | (672)
Ending balance | 75 | 95 | 2,705
Change in Fair Value of Cash Flow Hedges |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (3,393) | (4,361) | (5,179)
Transfer of HTM securities to AFS securities |  | 0 |
Cumulative effects from adoption of new accounting standards |  | (1,094) |
Other comprehensive income (loss) before reclassification | (5,103) | 1,087 | (44)
Amounts reclassified from accumulated other comprehensive income | 7,714 | 975 | 862
Other comprehensive income (loss) | 2,611 | 2,062 | 818
Ending balance | (782) | (3,393) | (4,361)
Unrealized Gains (Losses) on BOLI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,026) | (1,102) | (1,465)
Transfer of HTM securities to AFS securities |  | 0 |
Cumulative effects from adoption of new accounting standards |  | 0 |
Other comprehensive income (loss) before reclassification | (646) | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 77 | 76 | 363
Other comprehensive income (loss) | (569) | 76 | 363
Ending balance | (1,595) | (1,026) | (1,102)
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (10,273) | (884) | (3,809)
Transfer of HTM securities to AFS securities |  | 0 |
Cumulative effects from adoption of new accounting standards |  | (46) |
Other comprehensive income (loss) before reclassification | 44,141 | (9,624) | 2,892
Amounts reclassified from accumulated other comprehensive income | 1,707 | 281 | 33
Other comprehensive income (loss) | 45,848 | (9,343) | 2,925
Ending balance | $ 35,575 | $ (10,273) | $ (884)

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