Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands						5 Months Ended	9 Months Ended
	Oct. 11, 2016	Dec. 23, 2015	Dec. 15, 2015	Dec. 08, 2015	May 30, 2014	Feb. 18, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Aug. 31, 2011
Class of Stock [Line Items]
Gross proceeds from issuance of public offering							$ 503	$ 966
Preferred stock, aggregate purchase price of shares sold to Treasury							$ 0		$ 12,000
Common stock dividend rate				5.00%
Common stock dividend declared date							Oct. 11, 2016
Common stock dividend payable date							Dec. 13, 2016
Common stock dividend record date							Oct. 25, 2016
Common stock dividend additional common shares				294,161			399,088	294,507
Public Offering [Member]
Class of Stock [Line Items]
New shares		227,850	1,519,000
New shares price per share		$ 19.75	$ 19.75
Net proceeds from issuance of public offering							$ 32,500
Gross proceeds from issuance of public offering							34,500
Issuance costs							2,000
Investment in subsidiary							$ 19,800
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, redemption price						$ 12,000
Preferred stock, aggregate purchase price of shares sold to Treasury										$ 25,000
Preferred stock, shares sold to Treasury							0		12,000	25,000
Preferred stock, liquidation value							$ 1,000		$ 1,000	$ 1,000
Preferred stock par value							$ 2.50		$ 2.50	$ 2.50
Preferred stock, redemption shares					13,000
Preferred stock, shares outstanding							0		12,000
Preferred stock, dividend rate						1.00%		1.00%
Preferred stock, redemption date							Feb. 18, 2016
Subsequent Event [Member]
Class of Stock [Line Items]
Common stock dividend rate	5.00%