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, 2022	Dec. 31, 2021
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 213,913	$ 341,628
Gross Unrealized Gain	45	3,388
Gross Unrealized Loss	17,863	2,810
Estimated Fair Value	196,095	342,206
Held to maturity:
Amortized Cost	713,390	184,263
Gross Unrealized Gains	520	8,364
Gross Unrealized Losses	31,413	155
Estimated Fair Value	682,497	192,472
U.S. government agencies
Available for sale:
Available-for-sale debt securities, amortized cost basis		10,013
Gross Unrealized Gain		0
Gross Unrealized Loss		42
Estimated Fair Value		9,971
Held to maturity:
Amortized Cost	9,066
Gross Unrealized Losses	1,181
Estimated Fair Value	7,885
Corporate bonds
Available for sale:
Available-for-sale debt securities, amortized cost basis	35,029	35,080
Gross Unrealized Gain		940
Gross Unrealized Loss	1,455	85
Estimated Fair Value	33,574	35,935
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	144,128	221,610
Gross Unrealized Gain	18	1,477
Gross Unrealized Loss	14,962	1,779
Estimated Fair Value	129,184	221,308
Held to maturity:
Amortized Cost	138,802	2,953
Gross Unrealized Gains	2	0
Gross Unrealized Losses	12,807	37
Estimated Fair Value	125,997	2,916
Collateralized mortgage obligations
Available for sale:
Available-for-sale debt securities, amortized cost basis	25,256	74,925
Gross Unrealized Gain	17	971
Gross Unrealized Loss	1,384	904
Estimated Fair Value	23,889	74,992
Held to maturity:
Amortized Cost	44,750
Gross Unrealized Losses	6,147
Estimated Fair Value	38,603
Municipal securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	9,500
Gross Unrealized Gain	10
Gross Unrealized Loss	62
Estimated Fair Value	9,448
Held to maturity:
Amortized Cost	196,262	181,310
Gross Unrealized Gains	518	8,364
Gross Unrealized Losses	8,446	118
Estimated Fair Value	188,334	$ 189,556
Treasury securities
Held to maturity:
Amortized Cost	324,510
Gross Unrealized Losses	2,832
Estimated Fair Value	$ 321,678

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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