OTHER COMPREHENSIVE INCOME (LOSS): (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, January 1	$ (7,472)	$ (10,494)
Current Period Change	(6,497)	3,022
Ending balance, December 31	(13,969)	(7,472)
Unrealized gains losses on securities available-for-sale without other than temporary impairment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, January 1	17,044	18,136
Current Period Change	(19,543)	(1,092)
Ending balance, December 31	(2,499)	17,044
Unrealized gains losses on securities available-for-sale with other than temporary impairment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, January 1	(3,613)	(5,396)
Current Period Change	2,477	1,783
Ending balance, December 31	(1,136)	(3,613)
Total unrealized loss on securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, January 1	13,431	12,740
Current Period Change	(17,066)	691
Ending balance, December 31	(3,635)	13,431
Unrealized loss on retirement plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, January 1	(20,903)	(23,234)
Current Period Change	10,569	(2,331)
Ending balance, December 31	$ (10,334)	$ (20,903)