INVESTMENT SECURITIES: (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Less than 12 Months	$ 27,989	$ 26,470
Unrealized Losses, Less than 12 Months	(805)	(284)
Fair Value, 12 Months or More	27,555	29,456
Unrealized Losses, 12 Months or More	(1,146)	(726)
Fair Value, Total	55,544	55,926
Unrealized Losses, Total	(1,951)	(1,010)
US Government Agencies [Member]
Fair Value, Less than 12 Months	7,439	7,840
Unrealized Losses, Less than 12 Months	(128)	(69)
Fair Value, 12 Months or More	6,800	7,189
Unrealized Losses, 12 Months or More	(226)	(152)
Fair Value, Total	14,239	15,029
Unrealized Losses, Total	(354)	(221)
Taxable Municipals
Fair Value, Less than 12 Months	3,545	2,403
Unrealized Losses, Less than 12 Months	(111)	(44)
Fair Value, 12 Months or More	746	767
Unrealized Losses, 12 Months or More	(54)	(34)
Fair Value, Total	4,291	3,170
Unrealized Losses, Total	(165)	(78)
Corporate Bonds
Fair Value, Less than 12 Months	2,402	1,507
Unrealized Losses, Less than 12 Months	(130)	(26)
Fair Value, 12 Months or More
Unrealized Losses, 12 Months or More
Fair Value, Total	2,402	1,507
Unrealized Losses, Total	(130)	(26)
Mortgage Backed Securities [Member]
Fair Value, Less than 12 Months	14,603	14,720
Unrealized Losses, Less than 12 Months	(436)	(145)
Fair Value, 12 Months or More	20,009	21,500
Unrealized Losses, 12 Months or More	(866)	(540)
Fair Value, Total	34,612	36,220
Unrealized Losses, Total	$ (1,302)	$ (685)