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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available for sale:
Amortized Cost	$ 238,992	$ 160,182
Gross Unrealized Gains	691	16
Gross Unrealized Losses	1,550	3,273
Estimated Fair Value	238,133	156,925
Held to maturity:
Amortized Cost	179,081	189,371
Gross Unrealized Gains	3,155	1,484
Gross Unrealized Losses	1,085	4,700
Estimated Fair Value	181,151	186,155
Corporate bonds
Available for sale:
Amortized Cost	18,842	25,254
Gross Unrealized Gains	178	6
Gross Unrealized Losses	0	377
Estimated Fair Value	19,020	24,883
Municipal securities
Available for sale:
Amortized Cost	7,769	7,841
Gross Unrealized Gains	0	0
Gross Unrealized Losses	305	622
Estimated Fair Value	7,464	7,219
Mortgage-backed securities
Available for sale:
Amortized Cost	91,801	61,298
Gross Unrealized Gains	20	0
Gross Unrealized Losses	863	1,608
Estimated Fair Value	90,958	59,690
Collateralized mortgage obligations
Available for sale:
Amortized Cost	120,580	65,789
Gross Unrealized Gains	493	10
Gross Unrealized Losses	382	666
Estimated Fair Value	120,691	65,133
Municipal securities
Held to maturity:
Amortized Cost	146,993	149,420
Gross Unrealized Gains	2,696	901
Gross Unrealized Losses	516	3,889
Estimated Fair Value	149,173	146,432
Mortgage-backed securities
Held to maturity:
Amortized Cost	23,337	28,450
Gross Unrealized Gains	278	318
Gross Unrealized Losses	66	290
Estimated Fair Value	23,549	28,478
Collateralized mortgage obligations
Held to maturity:
Amortized Cost	8,751	11,501
Gross Unrealized Gains	181	265
Gross Unrealized Losses	503	521
Estimated Fair Value	$ 8,429	$ 11,245

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