INCOME TAXES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal:
Currently payable	$ 9,890	$ 9,388	$ 10,177
Deferred	(774)	2,120	740
Federal income tax expense (benefit), continuing operations	9,116	11,508	10,917
State:
Currently payable	1,426	1,928	3,629
Deferred	(150)	753	(779)
State and local income tax expense (benefit), continuing operations	1,276	2,681	2,850
TOTAL	$ 10,392	$ 14,189	$ 13,767