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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 | Jun. 30, 2021 | Dec. 31, 2020
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Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | $ 432,638 | $ 363,097
Gross Unrealized Gain | 14,924 | 17,794
Gross Unrealized Loss | 926 | 96
Estimated Fair Value | 446,636 | 380,795
U.S. government agencies |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 10,014 |
Gross Unrealized Gain | 134 |
Gross Unrealized Loss | 0 |
Estimated Fair Value | 10,148 |
Corporate bonds |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 39,153 | 29,608
Gross Unrealized Gain | 1,356 | 1,382
Gross Unrealized Loss | 78 | 8
Estimated Fair Value | 40,431 | 30,982
Mortgage-backed securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 155,970 | 104,210
Gross Unrealized Gain | 2,140 | 3,041
Gross Unrealized Loss | 794 | 87
Estimated Fair Value | 157,316 | 107,164
Collateralized mortgage obligations |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 65,282 | 64,611
Gross Unrealized Gain | 1,660 | 2,335
Gross Unrealized Loss | 14 | 1
Estimated Fair Value | 66,928 | 66,945
Municipal securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 162,219 | 164,668
Gross Unrealized Gain | 9,634 | 11,036
Gross Unrealized Loss | 40 | 0
Estimated Fair Value | $ 171,813 | $ 175,704

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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=121645371&loc=d3e27161-111563 + Details
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