Acquisitions, Goodwill and Other Intangible Assets (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	Apr. 01, 2015	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Amortization of intangible assets			$ 1,872,000	$ 1,960,000	$ 1,546,000
FinalContingentConsideration		$ 10,100,000
Professional services			$ 5,916,000	5,622,000	5,617,000
General and Administrative Expense
Business Acquisition [Line Items]
Amortization of intangible assets				$ 2,000,000	1,500,000
Woodway Financial Advisors
Business Acquisition [Line Items]
Cash and stock	$ 30,600,000
Maximum earn-out amount	$ 15,000,000
Percent of earn-out amount paid in cash		54.84%
Percent of earn-out amount paid in shares		45.16%
Contingent consideration		$ 9,300,000
Professional services					732,000
Pro Forma [Member] | Woodway Financial Advisors
Business Acquisition [Line Items]
Transaction costs					$ 1,100,000