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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | $ 371,189 | $ 210,212
Gross Unrealized Gain | 6,415 | 2,864
Gross Unrealized Loss | 542 | 360
Estimated Fair Value | 377,062 | 212,716
Held to maturity: |  |
Amortized Cost | 0 | 155,458
Gross Unrealized Gains |  | 5,018
Gross Unrealized Losses |  | 16
Estimated Fair Value |  | 160,460
Corporate bonds |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 19,648 | 19,667
Gross Unrealized Gain | 144 | 592
Gross Unrealized Loss | 103 | 0
Estimated Fair Value | 19,689 | 20,259
Mortgage-backed securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 93,979 | 83,967
Gross Unrealized Gain | 2,508 | 550
Gross Unrealized Loss | 67 | 335
Estimated Fair Value | 96,420 | 84,182
Held to maturity: |  |
Amortized Cost |  | 14,365
Gross Unrealized Gains |  | 198
Gross Unrealized Losses |  | 13
Estimated Fair Value |  | 14,550
Collateralized mortgage obligations |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 87,001 | 89,798
Gross Unrealized Gain | 487 | 1,146
Gross Unrealized Loss | 84 | 17
Estimated Fair Value | 87,404 | 90,927
Held to maturity: |  |
Amortized Cost |  | 2,677
Gross Unrealized Gains |  | 110
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 2,787
Municipal securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 170,561 | 16,780
Gross Unrealized Gain | 3,276 | 576
Gross Unrealized Loss | 288 | 8
Estimated Fair Value | $ 173,549 | 17,348
Held to maturity: |  |
Amortized Cost |  | 138,416
Gross Unrealized Gains |  | 4,710
Gross Unrealized Losses |  | 3
Estimated Fair Value |  | $ 143,123

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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=118939692&loc=d3e27161-111563 + Details
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