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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Other Commitments			$ 81,593,000	$ 83,786,000
TOTAL			424,458,000	387,701,000
Minimum
Loss Contingencies [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates	$ 0.0450	$ 0.0400
Maximum
Loss Contingencies [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates	$ 0.0775	$ 0.0725
Commercial Operating Lines
Loss Contingencies [Line Items]
TOTAL			285,524,000	246,855,000
Commercial letters of credit
Loss Contingencies [Line Items]
TOTAL			4,673,000	5,012,000
Home Equity
Loss Contingencies [Line Items]
TOTAL			$ 57,341,000	$ 57,060,000

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