Dividend Reinvestment Plan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jul. 11, 2017	Jul. 20, 2012
DIVIDEND REINVESTMENT PLAN
Common shares to be issued				2,000,000	2,000,000
Minimum percentage of cash dividends	25.00%
Maximum additional cash purchase of common shares per fiscal quarter	$ 10
Percentage estimated value for dividend reinvestments	95.00%
Percentage estimated value for additional optional cash purchases	100.00%
Maximum value of common shares that may be purchased or received via transfer by participants under the dividend reinvestment plan	$ 40
Estimated value per common share	$ 19.25		$ 19.00
Purchase price per common share for dividend reinvestments	18.29		18.05
Purchase price per common share additional optional cash purchases	$ 19.25		$ 19.00
Notice period to participants	10 days
Shares issued pursuant to dividend reinvestments	87,000	82,000
Shares issued pursuant to additional optional cash purchases under the plan	62,000	49,000
Value of shares issued pursuant to dividend reinvestments	$ 1,584	$ 1,479
Value of shares issued pursuant to additional optional cash purchases under the plan	$ 1,203	$ 929