ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Net Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (6,614)	$ (1,297)
Other comprehensive income before reclassification, net of tax			3,314	7,990
Reclassifications from accumulated other comprehensive income, net of tax			(412)	(807)
Total other comprehensive income	$ 1,822	$ 1,653	2,902	7,183
Ending Balance	(3,712)	5,886	(3,712)	5,886
Unrealized Gains (Losses) on Investments Available-for-Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			1,642	6,566
Other comprehensive income before reclassification, net of tax			3,314	7,990
Reclassifications from accumulated other comprehensive income, net of tax			(767)	(1,154)
Total other comprehensive income			2,547	6,836
Ending Balance	4,189	13,402	4,189	13,402
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(8,256)	(7,863)
Other comprehensive income before reclassification, net of tax			0	0
Reclassifications from accumulated other comprehensive income, net of tax			355	347
Total other comprehensive income			355	347
Ending Balance	$ (7,901)	$ (7,516)	$ (7,901)	$ (7,516)