PREMISES AND EQUIPMENT: (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Gross [Abstract]
Land	$ 11,627	$ 11,353
Building and leasehold improvements	55,532	55,074
Furniture and Fixtures, Gross	46,796	45,602
Property Plant And Equipment Gross	113,955	112,029
Less accumulated depreciation	(63,424)	(60,227)
TOTAL	$ 50,531	$ 51,802