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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 238,790	$ 239,945
Gross Unrealized Gain	701	127
Gross Unrealized Loss	2,512	7,097
Estimated Fair Value	236,979	232,975
Held to maturity:
Amortized Cost	160,980	163,164
Gross Unrealized Gains	2,708	1,258
Gross Unrealized Losses	578	1,622
Estimated Fair Value	163,110	162,800
Corporate bonds
Available for sale:
Available-for-sale debt securities, amortized cost basis	19,724	19,743
Gross Unrealized Gain	47	0
Gross Unrealized Loss	27	789
Estimated Fair Value	19,744	18,954
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	95,322	93,083
Gross Unrealized Gain	269	52
Gross Unrealized Loss	1,845	3,676
Estimated Fair Value	93,746	89,459
Held to maturity:
Amortized Cost	16,521	17,163
Gross Unrealized Gains	93	54
Gross Unrealized Losses	313	500
Estimated Fair Value	16,301	16,717
Collateralized mortgage obligations
Available for sale:
Available-for-sale debt securities, amortized cost basis	108,002	111,341
Gross Unrealized Gain	184	0
Gross Unrealized Loss	579	2,372
Estimated Fair Value	107,607	108,969
Held to maturity:
Amortized Cost	3,747	4,059
Gross Unrealized Gains	90	48
Gross Unrealized Losses	11	28
Estimated Fair Value	3,826	4,079
Municipal securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	15,742	15,778
Gross Unrealized Gain	201	75
Gross Unrealized Loss	61	260
Estimated Fair Value	15,882	15,593
Held to maturity:
Amortized Cost	140,712	141,942
Gross Unrealized Gains	2,525	1,156
Gross Unrealized Losses	254	1,094
Estimated Fair Value	$ 142,983	$ 142,004

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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).

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