Dividends and Basic Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Dividends and Basic Earnings Per Common Share [Abstract]
Dividends on common stock (in dollars per share)			$ 6.30	$ 6.20
Dividends payable recorded date			Jun. 09, 2014
Dividends payable, date to be paid			Jul. 01, 2014	Jul. 01, 2013
Percentage increase in cash dividend per share (in hundredths)			1.60%
Earnings per share for the period [Abstract]
Net Income	$ 6,104	$ 5,565	$ 12,386	$ 11,816
Average Number of Common Shares Outstanding (in shares)	777,882	777,882	777,882	777,882
Basic Earnings Per Common Share (in dollars per share)	$ 7.84	$ 7.15	$ 15.92	$ 15.19