ALLOWANCE FOR LOAN LOSSES: ALLOWANCE FOR LOAN LOSSES: (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	$ 9,860	$ 14,758	$ 17,301
Added	492	1,090	2,311
Charged Off	(391)	(117)	(1,271)
Payments	(1,396)	(5,871)	(3,583)
December 31,	8,565	9,860	14,758
Commercial
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	3,584	8,955	12,327
Added	0	0	441
Charged Off	0	0	(1,069)
Payments	(198)	(5,371)	(2,744)
December 31,	3,386	3,584	8,955
Residential
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	5,593	5,189	4,330
Added	123	748	1,523
Charged Off	(321)	(65)	(93)
Payments	(948)	(279)	(571)
December 31,	4,447	5,593	5,189
Consumer
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	683	614	644
Added	369	342	347
Charged Off	(70)	(52)	(109)
Payments	(250)	(221)	(268)
December 31,	$ 732	$ 683	$ 614