Restructuring (Details) - USD ($)	3 Months Ended							12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning of period	$ 83,000	$ 337,000	$ 1,359,000	$ 1,977,000
Restructuring Reserve, Settled with Cash	(83,000)	(254,000)	(335,000)	(618,000)
Restructuring Reserve, end of period	0	83,000	1,024,000	1,359,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning of period	83,000	337,000	1,359,000	1,977,000
Restructuring Reserve, Settled with Cash	(83,000)	(254,000)	(335,000)	(618,000)
Restructuring Reserve, end of period	0	$ 83,000	$ 1,024,000	$ 1,359,000
Banyan Acquisition and WMT Management Restructuring Plan [Member] | Wealth Management and Trust Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost					$ 900,000	$ 1,100,000	$ 700,000	$ 3,700,000
Restructuring and Related Cost, Cost Incurred to Date							$ 6,400,000
Restructuring and Related Cost, Expected Cost Remaining	$ 0