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SHORT-TERM BORROWINGS: (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase-agreements	$ 26,406	$ 27,521
Average amount outstanding	41,557	39,704
Maximum amount outstanding at a month end	$ 69,656	$ 85,714
Average interest rate during year (percent)	1.24%	0.62%
Interest rate at year-end (percent)	1.86%	0.96%
Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase-agreements	$ 546	$ 758
Maturity 30 to 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase-agreements	8,683	8,552
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase-agreements	6,307	6,282
Maturity Overnight [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase-agreements	$ 10,870	$ 11,929

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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