Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Gain [Member]	Total
Balance at Dec. 31, 2009	$ 8	$ 76,198	$ 83,767	$ 4,754	$ 164,727
Balance (in shares) at Dec. 31, 2009	780,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			21,118		21,118
Cash Dividends Declared on Common Stock			(8,855)		(8,855)
Repurchase of Common Stock		(608)			(608)
Repurchase of Common Stock (in shares)	(1,520)
Change in Net Unrealized Gain on Securities Available-for-Sale				(3,141)	(3,141)
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			22,209		22,209
Cash Dividends Declared on Common Stock			(9,158)		(9,158)
Repurchase of Common Stock					0
Change in Net Unrealized Gain on Securities Available-for-Sale				3,054	3,054
Balance at Dec. 31, 2011	8	75,590	109,081	4,667	189,346
Balance (in shares) at Dec. 31, 2011	779,424				779,424
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income			23,349		23,349
Cash Dividends Declared on Common Stock			(9,418)		(9,418)
Repurchase of Common Stock		(576)			(576)
Repurchase of Common Stock (in shares)	(1,542)
Change in Net Unrealized Gain on Securities Available-for-Sale				2,332	2,332
Balance at Dec. 31, 2012	$ 8	$ 75,014	$ 123,012	$ 6,999	$ 205,033
Balance (in shares) at Dec. 31, 2012	777,882				777,882