RETIREMENT AND POSTRETIREMENT PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 10
Interest cost	510	58
Expected return on assets	0	0
Curtailment gain	(3,394)	0
Amortization of unrealized loss	(13)	0
Net periodic cost (gain)	(2,888)	68
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year			145
Defined Benefit Plan, Contributions by Employer	17
BMP, Employee And Outside Director Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	344	338
Expected return on assets	(414)	(444)
Curtailment gain	0	0
Amortization of unrealized loss	480	261
Net periodic cost (gain)	410	155
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	5
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
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	$ 45