Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 22,019	$ 17,822
Weighted average shares outstanding - basic and diluted (in shares)	5,113,077	5,111,201
Net income per common share- basic and diluted (in dollars per share)	$ 4.31	$ 3.49