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STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 01, 2018
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | $ 2,459,465,000 | $ 1,924,581,000 | $ 1,831,077,000 | $ 1,046,329,000 | $ 1,924,581,000 | $ 1,046,329,000 |
Other comprehensive income (loss): |  |  |  |  |  |  |
Other comprehensive income (loss) | 19,670,000 | 18,670,000 | (1,628,000) | (11,426,000) | 38,340,000 | (13,054,000) |
Ending balance | 2,512,295,000 | 2,459,465,000 | 1,864,870,000 | 1,831,077,000 | 2,512,295,000 | 1,864,870,000 |
Accounting Standards Update 2017-12 |  |  |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | 400,000 |  |  |  |
Cumulative effects from adoption of new accounting standard |  |  |  |  |  |  | $ 400,000
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | 8,397,000 | (10,273,000) | (12,310,000) | (884,000) | (10,273,000) | (884,000) |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | 0 |  |  | 0 |
Cumulative effects from adoption of new accounting standard |  |  | (107,000) |  |  | (107,000) |
Other comprehensive income (loss) before reclassification | 19,556,000 |  | (1,911,000) |  | (38,178,000) | (13,138,000) |
Amounts reclassified from AOCI into earnings | 114,000 |  | 283,000 |  | 162,000 | 84,000 |
Other comprehensive income (loss) | 19,670,000 | 18,670,000 | (1,628,000) | (11,426,000) | 38,340,000 | (13,054,000) |
Ending balance | 28,067,000 | 8,397,000 | (14,045,000) | (12,310,000) | 28,067,000 | (14,045,000) |
Unrealized Gains (Losses) on AFS Securities |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | 14,047,000 | (5,949,000) | (11,485,000) | 1,874,000 | (5,949,000) | 1,874,000 |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | 2,785,000 |  |  | 2,785,000 |
Cumulative effects from adoption of new accounting standard |  |  | 404,000 |  |  | 404,000 |
Other comprehensive income (loss) before reclassification | 22,151,000 |  | (2,586,000) |  | (42,233,000) | (15,777,000) |
Amounts reclassified from AOCI into earnings | (73,000) |  | 69,000 |  | (159,000) | (99,000) |
Other comprehensive income (loss) | 22,078,000 |  | (2,517,000) |  | 42,074,000 | (15,876,000) |
Ending balance | 36,125,000 | 14,047,000 | (10,813,000) | (11,485,000) | 36,125,000 | (10,813,000) |
Unrealized Gains (Losses) for AFS Securities Transferred to HTM |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | 90,000 | 95,000 | 2,406,000 | 2,705,000 | 95,000 | 2,705,000 |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | (2,785,000) |  |  | (2,785,000) |
Cumulative effects from adoption of new accounting standard |  |  | 583,000 |  |  | 583,000 |
Other comprehensive income (loss) before reclassification | 0 |  | 0 |  | 0 | 0 |
Amounts reclassified from AOCI into earnings | (5,000) |  | (99,000) |  | (10,000) | (398,000) |
Other comprehensive income (loss) | (5,000) |  | (99,000) |  | (10,000) | (398,000) |
Ending balance | 85,000 | 90,000 | 105,000 | 2,406,000 | 85,000 | 105,000 |
Change in Fair Value of Cash Flow Hedge |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | (4,733,000) | (3,393,000) | (2,148,000) | (4,361,000) | (3,393,000) | (4,361,000) |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | 0 |  |  | 0 |
Cumulative effects from adoption of new accounting standard |  |  | (1,094,000) |  |  | (1,094,000) |
Other comprehensive income (loss) before reclassification | (2,595,000) |  | 675,000 |  | 4,055,000 | 2,639,000 |
Amounts reclassified from AOCI into earnings | 173,000 |  | 294,000 |  | 293,000 | 543,000 |
Other comprehensive income (loss) | (2,422,000) |  | 969,000 |  | (3,762,000) | 3,182,000 |
Ending balance | (7,155,000) | (4,733,000) | (2,273,000) | (2,148,000) | (7,155,000) | (2,273,000) |
Unrealized Gains (Losses) on BOLI |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |  |  |  |  |
Beginning balance | (1,007,000) | (1,026,000) | (1,083,000) | (1,102,000) | (1,026,000) | (1,102,000) |
Other comprehensive income (loss): |  |  |  |  |  |  |
Transfers of HTM securities to AFS securities |  |  | 0 |  |  | 0 |
Cumulative effects from adoption of new accounting standard |  |  | 0 |  |  | 0 |
Other comprehensive income (loss) before reclassification | 0 |  | 0 |  | 0 | 0 |
Amounts reclassified from AOCI into earnings | 19,000 |  | 19,000 |  | 38,000 | 38,000 |
Other comprehensive income (loss) | 19,000 |  | 19,000 |  | 38,000 | 38,000 |
Ending balance | $ (988,000) | $ (1,007,000) | $ (1,064,000) | $ (1,083,000) | $ (988,000) | $ (1,064,000) |

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