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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 265,236	$ 265,236	$ 363,097
Gross Unrealized Gain	4,827		17,794
Gross Unrealized Loss	993		96
Estimated Fair Value	269,070		380,795
Held to maturity:
Amortized Cost	173,676		0
Gross Unrealized Gains	9,139
Gross Unrealized Losses	184
Estimated Fair Value	182,631
U.S. government agencies
Available for sale:
Available-for-sale debt securities, amortized cost basis	10,013
Gross Unrealized Gain	46
Gross Unrealized Loss	0
Estimated Fair Value	10,059
Corporate bonds
Available for sale:
Available-for-sale debt securities, amortized cost basis	34,105		29,608
Gross Unrealized Gain	1,233		1,382
Gross Unrealized Loss	92		8
Estimated Fair Value	35,246		30,982
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	157,846		104,210
Gross Unrealized Gain	2,143		3,041
Gross Unrealized Loss	847		87
Estimated Fair Value	159,142		107,164
Held to maturity:
Amortized Cost	3,042
Gross Unrealized Gains	0
Gross Unrealized Losses	37
Estimated Fair Value	3,005
Collateralized mortgage obligations
Available for sale:
Available-for-sale debt securities, amortized cost basis	63,272		64,611
Gross Unrealized Gain	1,405		2,335
Gross Unrealized Loss	54		1
Estimated Fair Value	64,623		66,945
Municipal securities
Available for sale:
Available-for-sale debt securities, amortized cost basis			164,668
Gross Unrealized Gain			11,036
Gross Unrealized Loss			0
Estimated Fair Value			$ 175,704
Held to maturity:
Amortized Cost	170,634
Gross Unrealized Gains	9,139
Gross Unrealized Losses	147
Estimated Fair Value	$ 179,626

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