ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Net Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (6,614)	$ (1,297)
Other comprehensive income before reclassification, net of tax			3,382	6,385
Reclassifications from accumulated other comprehensive income, net of tax			(245)	(623)
Total other comprehensive income	$ 235	$ (1,421)	3,137	5,762
Ending Balance	(3,477)	4,465	(3,477)	4,465
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			3,382	6,385
Reclassifications from accumulated other comprehensive income, net of tax			(767)	(1,154)
Total other comprehensive income			2,615	5,231
Ending Balance	4,257	11,797	4,257	11,797
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			522	531
Total other comprehensive income			522	531
Ending Balance	$ (7,734)	$ (7,332)	$ (7,734)	$ (7,332)