GOODWILL AND INTANGIBLE ASSETS: (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 15,505	$ 13,269
Accumulated Amortization	10,570	9,376
Customer list intangible
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,669	4,669
Accumulated Amortization	4,120	4,012
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Amount	10,836	8,600
Accumulated Amortization	$ 6,450	$ 5,364