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
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

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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