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RETIREMENT AND POSTRETIREMENT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2015
Postretirement Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Service Cost $ 0 $ 10 $ 9 $ 20  
Defined Benefit Plan, Interest Cost 29 58 538 116  
Defined Benefit Plan, Expected Return on Plan Assets 0 0 0 0  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments     (3,394) [1] 0  
Amortization of unrealized loss (13) 0 (25) 0  
Net periodic cost 16 68 (2,872) 136  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year         $ 145
Defined Benefit Plan, Contributions by Employer 15   32    
BMP, Employee And Outside Director Retirement Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Service Cost 0 0 0 0  
Defined Benefit Plan, Interest Cost 343 338 687 676  
Defined Benefit Plan, Expected Return on Plan Assets (414) (444) (828) (888)  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments     0 0  
Amortization of unrealized loss 480 261 959 522  
Net periodic cost 409 $ 155 818 $ 310  
Employee Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year         14
Defined Benefit Plan, Contributions by Employer 7   12    
BMP Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year         604
Defined Benefit Plan, Contributions by Employer 0   0    
Outside Director Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year         $ 188
Defined Benefit Plan, Contributions by Employer $ 44   $ 89    
[1] (1) The Postretirement Plan was amended effective March 31, 2015, whereby future retirees will not be eligible to participate in the plan. This plan amendment resulted in a curtailment gain.