MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available for sale:
Available-for-sale debt securities, amortized cost basis	$ 210,212	$ 239,945
Gross Unrealized Gain	2,864	127
Gross Unrealized Loss	360	7,097
Estimated Fair Value	212,716	232,975
Held to maturity:
Amortized Cost	155,458	163,164
Gross Unrealized Gains	5,018	1,258
Gross Unrealized Losses	16	1,622
Estimated Fair Value	160,460	162,800
Corporate bonds
Available for sale:
Available-for-sale debt securities, amortized cost basis	19,667	19,743
Gross Unrealized Gain	592	0
Gross Unrealized Loss	0	789
Estimated Fair Value	20,259	18,954
Mortgage-backed securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	83,967	93,083
Gross Unrealized Gain	550	52
Gross Unrealized Loss	335	3,676
Estimated Fair Value	84,182	89,459
Held to maturity:
Amortized Cost	14,365	17,163
Gross Unrealized Gains	198	54
Gross Unrealized Losses	13	500
Estimated Fair Value	14,550	16,717
Collateralized mortgage obligations
Available for sale:
Available-for-sale debt securities, amortized cost basis	89,798	111,341
Gross Unrealized Gain	1,146	0
Gross Unrealized Loss	17	2,372
Estimated Fair Value	90,927	108,969
Held to maturity:
Amortized Cost	2,677	4,059
Gross Unrealized Gains	110	48
Gross Unrealized Losses	0	28
Estimated Fair Value	2,787	4,079
Municipal securities
Available for sale:
Available-for-sale debt securities, amortized cost basis	16,780	15,778
Gross Unrealized Gain	576	75
Gross Unrealized Loss	8	260
Estimated Fair Value	17,348	15,593
Held to maturity:
Amortized Cost	138,416	141,942
Gross Unrealized Gains	4,710	1,156
Gross Unrealized Losses	3	1,094
Estimated Fair Value	$ 143,123	$ 142,004

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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