INCOME TAXES: (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Other than temporary impairment	$ 5,820	$ 5,951
Net unrealized losses on retirement plans	6,815	13,612
Net unrealized losses on securities available for sale	2,701	0
Loan losses provision	7,845	8,606
Deferred compensation	7,118	7,729
Compensated absences	857	888
Post-retirement benefits	2,045	2,040
Deferred loss on acquisition	929	136
Other	2,771	2,104
GROSS DEFERRED ASSETS	36,901	41,066
Deferred tax liabilities:
Net unrealized gains on securities available-for-sale	0	(8,954)
Depreciation	(2,528)	(2,715)
Mortgage servicing rights	(752)	(700)
Pensions	(1,818)	(2,518)
Intangibles	(1,086)	(541)
Other	(1,563)	(1,381)
GROSS DEFERRED LIABILITIES	(7,747)	(16,809)
NET DEFERRED TAX ASSETS (LIABILITIES)	$ 29,154	$ 24,257