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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available for sale: |  |
Amortized Cost | $ 241,909 | $ 235,849
Gross Unrealized Gains | 0 | 69
Gross Unrealized Losses | 9,531 | 3,546
Estimated Fair Value | 232,378 | 232,372
Held to maturity: |  |
Amortized Cost | 164,839 | 174,684
Gross Unrealized Gains | 833 | 2,554
Gross Unrealized Losses | 3,076 | 448
Estimated Fair Value | 162,596 | 176,790
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 19,762 | 18,823
Gross Unrealized Gains | 0 | 64
Gross Unrealized Losses | 648 | 50
Estimated Fair Value | 19,114 | 18,837
Municipal securities |  |
Available for sale: |  |
Amortized Cost | 15,814 | 7,746
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 451 | 200
Estimated Fair Value | 15,363 | 7,546
Held to maturity: |  |
Amortized Cost | 142,419 | 146,496
Gross Unrealized Gains | 710 | 2,244
Gross Unrealized Losses | 2,420 | 218
Estimated Fair Value | 140,709 | 148,522
Mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 91,208 | 92,471
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,447 | 1,793
Estimated Fair Value | 86,761 | 90,678
Held to maturity: |  |
Amortized Cost | 17,871 | 22,026
Gross Unrealized Gains | 77 | 199
Gross Unrealized Losses | 611 | 230
Estimated Fair Value | 17,337 | 21,995
Collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 115,125 | 116,809
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 3,985 | 1,503
Estimated Fair Value | 111,140 | 115,311
Held to maturity: |  |
Amortized Cost | 4,549 | 6,162
Gross Unrealized Gains | 46 | 111
Gross Unrealized Losses | 45 | 0
Estimated Fair Value | $ 4,550 | $ 6,273

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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