Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning of period	$ 3,305	$ 739	$ 739
Restructuring and Related Cost, Incurred Cost	1,112	0
Restructuring Reserve, Settled with Cash	(849)	(489)
Restructuring Reserve, end of period	3,568	250	3,305	$ 739
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning of period	3,305	739	739
Restructuring and Related Cost, Incurred Cost	1,112	0
Restructuring Reserve, Settled with Cash	(849)	(489)
Restructuring Reserve, end of period	3,568	$ 250	3,305	739
Banyan Acquisition and WMT Management Restructuring Plan [Member] | Wealth Management and Trust Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	5,600
Restructuring and Related Cost, Incurred Cost	$ 1,100		$ 3,700	$ 700