MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 363,097	$ 210,212
Gross Unrealized Gain	17,794	2,864
Gross Unrealized Loss	96	360
Estimated Fair Value	380,795	212,716
Held to maturity:
Amortized Cost		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	29,608	19,667
Gross Unrealized Gain	1,382	592
Gross Unrealized Loss	8	0
Estimated Fair Value	30,982	20,259
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	104,210	83,967
Gross Unrealized Gain	3,041	550
Gross Unrealized Loss	87	335
Estimated Fair Value	107,164	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	64,611	89,798
Gross Unrealized Gain	2,335	1,146
Gross Unrealized Loss	1	17
Estimated Fair Value	66,945	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	164,668	16,780
Gross Unrealized Gain	11,036	576
Gross Unrealized Loss	0	8
Estimated Fair Value	$ 175,704	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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Amount, before tax, of unrealized loss 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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