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
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

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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Amortized cost of 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 of 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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