OTHER COMPREHENSIVE INCOME (LOSS) (Reclassification Adjustments Out of Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrealized gains/(losses) on investments available-for-sale Affected line item in the Statements of Income:
Investment securities gains		$ 1,932	$ 36	$ 5
Income before taxes		1,932	36	5
Tax expense		770	14	2
Net income		1,162	22	3
Amortization of defined benefit pension plan items Affected line item in the Statements of Income:
Recognized actuarial loss	[1]	(651)	1,736	(9,235)
Income before taxes		(651)	1,736	(9,235)
Tax expense		(258)	698	(3,662)
Net income		$ (393)	$ 1,038	$ (5,573)

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