Business Combinations (Narrative) (Details) $ in Thousands			12 Months Ended
	Aug. 01, 2017 USD ($)	Jan. 05, 2016 USD ($) property	Dec. 31, 2016 USD ($)	Aug. 31, 2017 USD ($)
Significant Acquisitions and Disposals [Line Items]
Common stock issued for acquisition			$ 8,100
Robshaw & Julian [Member]
Significant Acquisitions and Disposals [Line Items]
Assets under management	$ 175,000
Identified intangible assets	810
Goodwill	$ 1,000
Courier Capital [Member]
Significant Acquisitions and Disposals [Line Items]
Assets under management		$ 1,200,000		$ 1,600,000
Consideration including both cash and stock		9,000
Common stock issued for acquisition		8,100
Cash		918
Potential future stock payments		2,800
Potential future cash payments		$ 2,200
Number of properties | property		2
Payments to properties		$ 1,300
Identified intangible assets		3,928
Goodwill		$ 6,015