RETIREMENT AND POSTRETIREMENT PLANS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
BMP, Employee And Outside Director Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0	$ 0	$ 0	$ 0
Interest cost		343	343	686	687
Expected return on assets		(383)	(414)	(766)	(828)
Curtailment gain	[1]			0	0
Unrecognized past service liability		0	0	0	0
Amortization of unrealized loss		428	480	858	959
Net periodic cost (gain)		388	409	778	818
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0	9
Interest cost		16	29	32	538
Expected return on assets		0	0	0	0
Curtailment gain	[1]			0	(3,394)
Unrecognized past service liability		(2)	0	(4)	0
Amortization of unrealized loss		(1)	(13)	(2)	(25)
Net periodic cost (gain)		13	$ 16	26	$ (2,872)
Estimated employer contributions or benefit payments						$ 116
Contributions by employer		17		50
Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		7		11
BMP Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions or benefit payments						686
Contributions by employer		0		0
Outside Director Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions or benefit payments						$ 208
Contributions by employer		$ 41		$ 82

[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.