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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 235,849 | $ 160,182
Gross Unrealized Gains | 69 | 16
Gross Unrealized Losses | 3,546 | 3,273
Estimated Fair Value | 232,372 | 156,925
Held to maturity: |  |
Amortized Cost | 174,684 | 189,371
Gross Unrealized Gains | 2,554 | 1,484
Gross Unrealized Losses | 448 | 4,700
Estimated Fair Value | 176,790 | 186,155
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 18,823 | 25,254
Gross Unrealized Gains | 64 | 6
Gross Unrealized Losses | 50 | 377
Estimated Fair Value | 18,837 | 24,883
Municipal securities |  |
Available for sale: |  |
Amortized Cost | 7,746 | 7,841
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 200 | 622
Estimated Fair Value | 7,546 | 7,219
Mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 92,471 | 61,298
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,793 | 1,608
Estimated Fair Value | 90,678 | 59,690
Collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 116,809 | 65,789
Gross Unrealized Gains | 5 | 10
Gross Unrealized Losses | 1,503 | 666
Estimated Fair Value | 115,311 | 65,133
Municipal securities |  |
Held to maturity: |  |
Amortized Cost | 146,496 | 149,420
Gross Unrealized Gains | 2,244 | 901
Gross Unrealized Losses | 218 | 3,889
Estimated Fair Value | 148,522 | 146,432
Mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 22,026 | 28,450
Gross Unrealized Gains | 199 | 318
Gross Unrealized Losses | 230 | 290
Estimated Fair Value | 21,995 | 28,478
Collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 6,162 | 11,501
Gross Unrealized Gains | 111 | 265
Gross Unrealized Losses | 0 | 521
Estimated Fair Value | $ 6,273 | $ 11,245

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