Equity and EPS - Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Operations:
Net income	$ 8,490	$ 9,842	$ 7,911	$ 9,720	$ 18,332	$ 17,631
Less: Income attributable to participating securities	57		51		123	117
Net income attributable to common shareholders and used in earnings per share calculation	$ 8,433		$ 7,860		$ 18,209	$ 17,514
Share information:
Basic and diluted weighted average common shares (in shares)	16,899,079		17,021,599		16,956,502	16,994,864
Basic and diluted EPS (in dollars per share)	$ 0.50		$ 0.46		$ 1.07	$ 1.03