OTHER COMPREHENSIVE INCOME (LOSS), Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 493,947
Other comprehensive income (loss) before reclassifications	(470)	$ (556)
Amounts reclassified from accumulated other comprehensive loss	468	(246)
Net other comprehensive income (loss) during the period	(2)	(802)
Balance	549,611	477,947
Derivatives Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	0	0
Other comprehensive income (loss) before reclassifications	(526)	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Net other comprehensive income (loss) during the period	(526)	0
Balance	(526)	0
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,801)	(8,547)
Balance	(8,803)	(9,349)
Securities Held-to-Maturity and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(760)	(826)
Other comprehensive income (loss) before reclassifications	22	10
Amounts reclassified from accumulated other comprehensive loss	0	0
Net other comprehensive income (loss) during the period	22	10
Balance	(738)	(816)
Securities Available-for-Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(122)	736
Other comprehensive income (loss) before reclassifications	34	20
Amounts reclassified from accumulated other comprehensive loss	0	(760)
Net other comprehensive income (loss) during the period	34	(740)
Balance	(88)	(4)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(7,919)	(8,457)
Other comprehensive income (loss) before reclassifications	0	(586)
Amounts reclassified from accumulated other comprehensive loss	468	514
Net other comprehensive income (loss) during the period	468	(72)
Balance	$ (7,451)	$ (8,529)