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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 251,428 | $ 235,849
Gross Unrealized Gains | 48 | 69
Gross Unrealized Losses | 7,986 | 3,546
Estimated Fair Value | 243,490 | 232,372
Held to maturity: |  |
Amortized Cost | 167,239 | 174,684
Gross Unrealized Gains | 1,190 | 2,554
Gross Unrealized Losses | 1,988 | 448
Estimated Fair Value | 166,441 | 176,790
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 18,784 | 18,823
Gross Unrealized Gains | 0 | 64
Gross Unrealized Losses | 643 | 50
Estimated Fair Value | 18,141 | 18,837
Municipal securities |  |
Available for sale: |  |
Amortized Cost | 18,211 | 7,746
Gross Unrealized Gains | 48 | 0
Gross Unrealized Losses | 305 | 200
Estimated Fair Value | 17,954 | 7,546
Mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 95,062 | 92,471
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,820 | 1,793
Estimated Fair Value | 91,242 | 90,678
Collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 119,371 | 116,809
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 3,218 | 1,503
Estimated Fair Value | 116,153 | 115,311
Municipal securities |  |
Held to maturity: |  |
Amortized Cost | 143,295 | 146,496
Gross Unrealized Gains | 1,041 | 2,244
Gross Unrealized Losses | 1,481 | 218
Estimated Fair Value | 142,855 | 148,522
Mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 18,880 | 22,026
Gross Unrealized Gains | 88 | 199
Gross Unrealized Losses | 472 | 230
Estimated Fair Value | 18,496 | 21,995
Collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 5,064 | 6,162
Gross Unrealized Gains | 61 | 111
Gross Unrealized Losses | 35 | 0
Estimated Fair Value | $ 5,090 | $ 6,273

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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