OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in fair value of securities available for sale, pre tax amount	$ 9,095	$ (11,943)	$ (1,682)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, before Tax	191	230	(76)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	8,904	(12,173)	(1,606)
Change in fair value of cash flow hedges, pre tax amount	(969)	592	(3,588)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, before Tax	(3,662)	(5,723)	(5,417)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax	(1,122)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent	3,815	6,315	1,829
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(2,699)	1,302	(196)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	(1,357)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	44	(42)	(5)
Amortization of certain costs included in net periodic retirement costs, pre tax amount	(102)	(102)	(113)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	2	(4)	(34)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(4,000)	1,450	(44)
Total other comprehensive loss, pre tax amount	8,719	(4,408)	179
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(3,570)	4,578	541
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Tax	(78)	(94)	31
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent	(3,492)	4,672	510
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	396	(242)	1,466
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Tax	1,496	2,338	2,213
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Tax	459
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent	(1,559)	(2,580)	(747)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	1,103	(532)	80
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	554
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax	(18)	17	2
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax	42	42	46
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), before Tax	(1)	1	14
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	1,634	(592)	18
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(3,417)	1,500	(219)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	5,525	(7,365)	(1,141)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale and Write-down of Securities, Net of Tax	113	136	(45)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	5,412	(7,501)	(1,096)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(573)	350	(2,122)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Borrowings Expense, Net of Tax	(2,166)	(3,385)	(3,204)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, Net of Tax	(663)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	2,256	3,735	1,082
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(1,596)	770	(116)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax	(803)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax	26	(25)	(3)
Amortization of certain costs included in net periodic retirement costs, after tax amount	(60)	(60)	(67)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition Asset (Obligation), Net of Tax	1	(3)	(20)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(2,366)	858	(26)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 5,302	$ (2,908)	$ (40)