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SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM securities | $ 559,380 | $ 492,272
Gross Unrealized Gains | 25,226 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | 584,606 | 499,501
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM securities | 548,383 | 492,272
Gross Unrealized Gains | 25,179 | 7,375
Gross Unrealized (Losses) | 0 | (146)
Estimated Fair Value | 573,562 | $ 499,501
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM securities | 10,997 |
Gross Unrealized Gains | 47 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | $ 11,044 |

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