LOANS: (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 1,761,323	$ 1,780,350
Deferred (fees) costs	2,485	1,078
Allowance for loan losses	(19,946)	(18,839)	$ (20,068)	$ (21,958)
TOTAL	1,743,862	1,762,589
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,043,980	1,044,522
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	444,447	469,172
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 272,896	$ 266,656