Subsequent Event (Details Textual) (USD $)	3 Months Ended		1 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015	Jan. 15, 2015	Apr. 02, 2015
Subsequent Event [Line Items]
Professional services	$ 2,072,000	$ 1,382,000
Dividends declared per share	$ 0.50	$ 0.44
Subsequent Event
Subsequent Event [Line Items]
Dividends declared per share			$ 0.50
Dividends payable, date to be paid			Jul. 01, 2015
Dividends payable, date of record			Jun. 12, 2015
Woodway Financial Advisors
Subsequent Event [Line Items]
Date of acquisition agreement				Jan. 15, 2015
Assets under management				1,600,000,000
Business combination contingent consideration arrangements description	The acquisition consideration consisted of $25,331,200 in cash and 109,712 shares of Westwood common stock, valued at $6,668,000 using a stock price of $60.78, the average closing price of Westwood common stock over the 15 business days prior to January 15, 2015
Professional services	700,000
Woodway Financial Advisors | Subsequent Event
Subsequent Event [Line Items]
Total merger consideration					32,000,000
Earn-out payment					12 months
Earn-out period					Mar. 31, 2016
Earn-out payment					15,000,000
Business Acquisition, consideration pad in cash					25,331,200
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares					109,712
Business Acquisition, value of common stock					6,668,000
Business Acquisition, Share Price					$ 60.78
Business combination Earn-out amount paid in cash					54.84%
Business combination Earn-out amount paid through the issuance of shares					45.16%
Business Acquisition, transaction costs					$ 1,100,000