Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Capital Surplus[Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2012	$ 333,274	$ 46,249	$ 103,524	$ 309,270	$ (124,347)	$ (1,422)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,987			7,987
Other comprehensive income (loss)	91					91
Acquisition of Community Financial Corporation	28,706		4,434		24,272
Cash dividends declared	(6,064)			(6,064)
Stock-based compensation expense, net	457		(91)		548
Exercise of stock options	1,397		110		1,287
Ending balance at Mar. 31, 2013	365,848	46,249	107,977	311,193	(98,240)	(1,331)
Beginning Balance at Dec. 31, 2013	387,623	46,249	107,596	333,970	(95,202)	(4,990)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,803			13,803
Other comprehensive income (loss)	776					776
Cash dividends declared	(6,287)			(6,287)
Stock-based compensation expense, net	572		(746)		1,318
Exercise of stock options	199		(107)		306
Treasury Stock, Value, Acquired, Cost Method	(2,936)				(2,936)
Ending balance at Mar. 31, 2014	$ 393,750	$ 46,249	$ 106,743	$ 341,486	$ (96,514)	$ (4,214)