RETIREMENT PLANS: (Details 4)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan assets (percent)	100.00%	100.00%
Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan assets (percent)	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	88.00%
Target plan asset allocations range maximum (percent)	100.00%
Equity securities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	40.00%
Target plan asset allocations range maximum (percent)	65.00%
Percentage of plan assets (percent)	64.00%	55.00%
Equity securities | Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	95.00%
Target plan asset allocations range maximum (percent)	99.00%
Percentage of plan assets (percent)	99.00%	98.00%
Debt securities | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	35.00%
Target plan asset allocations range maximum (percent)	60.00%
Percentage of plan assets (percent)	34.00%	33.00%
Debt securities | Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	0.00%
Target plan asset allocations range maximum (percent)	0.00%
Percentage of plan assets (percent)	0.00%	0.00%
Other | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	0.00%
Target plan asset allocations range maximum (percent)	10.00%
Percentage of plan assets (percent)	2.00%	12.00%
Other | Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations range minimum (percent)	0.00%
Target plan asset allocations range maximum (percent)	5.00%
Percentage of plan assets (percent)	1.00%	2.00%