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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 246,830 | $ 160,182
Gross Unrealized Gains | 832 | 16
Gross Unrealized Losses | 1,429 | 3,273
Estimated Fair Value | 246,233 | 156,925
Held to maturity: |  |
Amortized Cost | 182,248 | 189,371
Gross Unrealized Gains | 3,409 | 1,484
Gross Unrealized Losses | 1,130 | 4,700
Estimated Fair Value | 184,527 | 186,155
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 18,861 | 25,254
Gross Unrealized Gains | 180 | 6
Gross Unrealized Losses | 8 | 377
Estimated Fair Value | 19,033 | 24,883
Municipal securities |  |
Available for sale: |  |
Amortized Cost | 7,793 | 7,841
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 300 | 622
Estimated Fair Value | 7,493 | 7,219
Mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 95,343 | 61,298
Gross Unrealized Gains | 24 | 0
Gross Unrealized Losses | 902 | 1,608
Estimated Fair Value | 94,465 | 59,690
Collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 124,833 | 65,789
Gross Unrealized Gains | 628 | 10
Gross Unrealized Losses | 219 | 666
Estimated Fair Value | 125,242 | 65,133
Municipal securities |  |
Held to maturity: |  |
Amortized Cost | 148,021 | 149,420
Gross Unrealized Gains | 2,869 | 901
Gross Unrealized Losses | 530 | 3,889
Estimated Fair Value | 150,360 | 146,432
Mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 24,642 | 28,450
Gross Unrealized Gains | 320 | 318
Gross Unrealized Losses | 93 | 290
Estimated Fair Value | 24,869 | 28,478
Collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 9,585 | 11,501
Gross Unrealized Gains | 220 | 265
Gross Unrealized Losses | 507 | 521
Estimated Fair Value | $ 9,298 | $ 11,245

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