ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassification Adjustments Out of Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrealized gains/(losses) on investments available-for-sale Affected line item in the Statements of Income:
Investment securities gains		$ 1,273	$ 1,932	$ 36
Income before taxes		1,273	1,932	36
Tax expense		504	770	14
Net income		769	1,162	22
Amortization of defined benefit pension plan items Affected line item in the Statements of Income:
Recognition of unrealized gain (loss)	[1]	(1,181)	(651)	1,736
Income before taxes		(1,181)	(651)	1,736
Tax expense		(467)	(258)	698
Net income/ (Loss)		$ (714)	$ (393)	$ 1,038

[1] This amount is included in the computation of net periodic benefit cost, see Note 13