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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 238,992 | $ 160,182
Gross Unrealized Gains | 691 | 16
Gross Unrealized Losses | 1,550 | 3,273
Estimated Fair Value | 238,133 | 156,925
Held to maturity: |  |
Amortized Cost | 179,081 | 189,371
Gross Unrealized Gains | 3,155 | 1,484
Gross Unrealized Losses | 1,085 | 4,700
Estimated Fair Value | 181,151 | 186,155
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 18,842 | 25,254
Gross Unrealized Gains | 178 | 6
Gross Unrealized Losses | 0 | 377
Estimated Fair Value | 19,020 | 24,883
Municipal securities |  |
Available for sale: |  |
Amortized Cost | 7,769 | 7,841
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 305 | 622
Estimated Fair Value | 7,464 | 7,219
Mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 91,801 | 61,298
Gross Unrealized Gains | 20 | 0
Gross Unrealized Losses | 863 | 1,608
Estimated Fair Value | 90,958 | 59,690
Collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 120,580 | 65,789
Gross Unrealized Gains | 493 | 10
Gross Unrealized Losses | 382 | 666
Estimated Fair Value | 120,691 | 65,133
Municipal securities |  |
Held to maturity: |  |
Amortized Cost | 146,993 | 149,420
Gross Unrealized Gains | 2,696 | 901
Gross Unrealized Losses | 516 | 3,889
Estimated Fair Value | 149,173 | 146,432
Mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 23,337 | 28,450
Gross Unrealized Gains | 278 | 318
Gross Unrealized Losses | 66 | 290
Estimated Fair Value | 23,549 | 28,478
Collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 8,751 | 11,501
Gross Unrealized Gains | 181 | 265
Gross Unrealized Losses | 503 | 521
Estimated Fair Value | $ 8,429 | $ 11,245

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