Dividends and Basic Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings per share for the period [Abstract]
Net Income	$ 7,538	$ 7,040	$ 22,042	$ 20,192
Weighted Average Number of Common Shares Outstanding (in shares)	792,387	785,852	792,223	785,668
Basic Earnings Per Common Share Amount (in dollars per share)	$ 9.51	$ 8.96	$ 27.82	$ 25.70