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, 2022	Dec. 31, 2021
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 326,646	$ 341,628
Gross Unrealized Gain	279	3,388
Gross Unrealized Loss	20,221	2,810
Estimated Fair Value	306,704	342,206
Held to maturity:
Amortized Cost	494,289	184,263
Gross Unrealized Gains	1,997	8,364
Gross Unrealized Losses	5,763	155
Estimated Fair Value	490,523	192,472
U.S. government agencies
Available for sale:
Available-for-sale debt securities, amortized cost basis	10,012	10,013
Gross Unrealized Gain	0	0
Gross Unrealized Loss	731	42
Estimated Fair Value	9,281	9,971
Corporate bonds
Available for sale:
Available-for-sale debt securities, amortized cost basis	35,055	35,080
Gross Unrealized Gain	86	940
Gross Unrealized Loss	645	85
Estimated Fair Value	34,496	35,935
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	212,489	221,610
Gross Unrealized Gain	131	1,477
Gross Unrealized Loss	14,728	1,779
Estimated Fair Value	197,892	221,308
Held to maturity:
Amortized Cost	32,287	2,953
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,534	37
Estimated Fair Value	30,753	2,916
Collateralized mortgage obligations
Available for sale:
Available-for-sale debt securities, amortized cost basis	69,090	74,925
Gross Unrealized Gain	62	971
Gross Unrealized Loss	4,117	904
Estimated Fair Value	65,035	74,992
Municipal securities
Held to maturity:
Amortized Cost	190,904	181,310
Gross Unrealized Gains	1,997	8,364
Gross Unrealized Losses	3,060	118
Estimated Fair Value	189,841	$ 189,556
Treasury securities
Held to maturity:
Amortized Cost	271,098
Gross Unrealized Gains	0
Gross Unrealized Losses	1,169
Estimated Fair Value	$ 269,929

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 allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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