SHORT-TERM BORROWINGS: (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Short Term Borrowings Disclosure [Abstract]
Average amount outstanding	$ 37,990	$ 50,499
Maximum amount outstanding at a month end	$ 83,452	$ 64,969
Average interest rate during year (percent)	0.20%	0.28%
Interest rate at year-end (percent)	0.12%	0.21%