STOCKHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated other comprehensive income
Balance at the beginning of the period	$ (9,057)	$ (2,979)	$ (4,885)
Reclassification from accumulated other comprehensive income, net of tax
Other Comprehensive Gain (Loss) before reclassifications	10,805	(5,853)	11
Amounts Reclassified from Accumulated other comprehensive income	4,831	(225)	1,895
Total other comprehensive income (loss)	15,636	(6,078)	1,906
Balance at the end of the period	6,579	(9,057)	(2,979)
Net unrealized holding gain on AFS securities:
Accumulated other comprehensive income
Balance at the beginning of the period	(5,776)	6,712	3,960
Reclassification from accumulated other comprehensive income, net of tax
Other Comprehensive Gain (Loss) before reclassifications	15,978	(9,650)	3,615
Amounts Reclassified from Accumulated other comprehensive income	(286)	(2,838)	(863)
Total other comprehensive income (loss)	15,692	(12,488)	2,752
Balance at the end of the period	9,916	(5,776)	6,712
Net loss on cash flow hedging derivatives
Accumulated other comprehensive income
Balance at the beginning of the period	(1,366)	(6,558)	(5,174)
Reclassification from accumulated other comprehensive income, net of tax
Other Comprehensive Gain (Loss) before reclassifications	(3,795)	3,032	(3,524)
Amounts Reclassified from Accumulated other comprehensive income	3,192	2,160	2,140
Total other comprehensive income (loss)	(603)	5,192	(1,384)
Balance at the end of the period	(1,969)	(1,366)	(6,558)
Net loss on terminated swap
Accumulated other comprehensive income
Balance at the beginning of the period	(1,925)	(2,378)	(2,996)
Reclassification from accumulated other comprehensive income, net of tax
Amounts Reclassified from Accumulated other comprehensive income	1,925	453	618
Total other comprehensive income (loss)	1,925	453	618
Balance at the end of the period	0	(1,925)	(2,378)
Net unrealized holding loss on pension plans
Accumulated other comprehensive income
Balance at the beginning of the period	10	(755)	(675)
Reclassification from accumulated other comprehensive income, net of tax
Other Comprehensive Gain (Loss) before reclassifications	(1,378)	765	(80)
Total other comprehensive income (loss)	(1,378)	765	(80)
Balance at the end of the period	$ (1,368)	$ 10	$ (755)