INVESTMENT SECURITIES: (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost	$ 68,825	$ 71,839
Gross Unrealized Gains	159	259
Gross Unrealized Losses	(1,951)	(1,010)
Approximate Fair Value	67,033	71,088
US Government Agencies [Member]
Amortized Cost	22,912	23,986
Gross Unrealized Gains	55	79
Gross Unrealized Losses	(354)	(221)
Approximate Fair Value	22,613	23,844
Taxable Municipals
Amortized Cost	4,457	4,466
Gross Unrealized Gains		9
Gross Unrealized Losses	(165)	(78)
Approximate Fair Value	4,292	4,397
Corporate Bonds
Amortized Cost	5,433	5,437
Gross Unrealized Gains	103	168
Gross Unrealized Losses	(130)	(26)
Approximate Fair Value	5,406	5,579
Mortgage Backed Securities [Member]
Amortized Cost	36,023	37,950
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(1,302)	(685)
Approximate Fair Value	$ 34,722	$ 37,268

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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