Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Capital Surplus[Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2011	$ 46,249	$ 103,335	$ 291,050	$ (125,593)	$ (3,907)	$ 311,134
Net income			10,031			10,031
Other comprehensive income					2,170	2,170
Cash dividends declared			(5,147)			(5,147)
Stock-based compensation expense, net		(263)		705		442
Exercise of stock options		(113)		601		488
Purchase of treasury shares				(3,072)		(3,072)
Ending balance at Mar. 31, 2012	46,249	102,959	295,934	(127,359)	(1,737)	316,046
Beginning balance at Dec. 31, 2012	46,249	103,524	309,270	(124,347)	(1,422)	333,274
Net income			7,987			7,987
Other comprehensive income					91	91
Acquisition of Community Financial Corporation		4,434		24,272		28,706
Cash dividends declared			(6,064)			(6,064)
Stock-based compensation expense, net		(91)		548		457
Exercise of stock options		110		1,287		1,397
Ending balance at Mar. 31, 2013	$ 46,249	$ 107,977	$ 311,193	$ (98,240)	$ (1,331)	$ 365,848