FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Details) - USD ($)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Other Commitments			$ 53,026,000	$ 50,850,000
TOTAL			364,756,000	354,592,000
Minimum
Loss Contingencies [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates	$ 0.0325	$ 0.0325
Maximum
Loss Contingencies [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates	$ 0.0650	$ 0.0525
Commercial Operating Lines
Loss Contingencies [Line Items]
TOTAL			259,019,000	249,354,000
Commercial letters of credit
Loss Contingencies [Line Items]
TOTAL			7,195,000	7,684,000
Home Equity
Loss Contingencies [Line Items]
TOTAL			$ 52,711,000	$ 54,388,000