Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, net [Member]	Total
Balance at Dec. 31, 2010	$ 8	$ 75,590	$ 96,030	$ 1,613	$ 173,241
Balance (in shares) at Dec. 31, 2010	779,424
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	0	0	16,548	0	16,548
Cash Dividends Declared on Common Stock ($5.65 and $5.90 per share)	0	0	(4,404)	0	(4,404)
Change in Net Unrealized Gain on Securities Available for Sale	0	0	0	3,835	3,835
Balance at Sep. 30, 2011	8	75,590	108,174	5,448	189,220
Balance (in shares) at Sep. 30, 2011	779,424
Balance at Dec. 31, 2011	8	75,590	109,081	4,667	189,346
Balance (in shares) at Dec. 31, 2011	779,424
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	0	0	17,684	0	17,684
Cash Dividends Declared on Common Stock ($5.65 and $5.90 per share)	0	0	(4,595)	0	(4,595)
Repurchase of Stock	0	(576)	0	0	(576)
Repurchase of Stock (in shares)	(1,542)
Change in Net Unrealized Gain on Securities Available for Sale	0	0	0	4,472	4,472
Balance at Sep. 30, 2012	$ 8	$ 75,014	$ 122,170	$ 9,139	$ 206,331
Balance (in shares) at Sep. 30, 2012	777,882