Earnings Per Share (Schedule Showing Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Income available to common shareholders	$ 5,186,000		$ 8,840,000		$ 19,833,000		$ 21,843,000
Distributed and undistributed earnings to unvested restricted stock	(91,000)		(188,000)		(379,000)		(432,000)
Distributed and undistributed earnings to common shareholders - Basic	5,095,000	[1]	8,652,000	[1]	19,454,000	[1]	21,411,000	[1]
Undistributed earnings reallocated to unvested restricted stock	4,000		(1,000)		1,000		(1,000)
Distributed and undistributed earnings to common shareholders - Diluted	5,099,000		8,651,000		19,455,000		21,410,000
Weighted average shares outstanding- Basic	28,015,846	[2]	26,804,334	[2]	27,405,797	[2]	24,549,042	[2]
Weighted average shares outstanding- Diluted	27,677,313		26,506,308		27,124,910		24,293,237
Earnings per common share - Basic	$ 0.19	[1]	$ 0.33	[1]	$ 0.72	[1]	$ 0.89	[1]
Earnings per common share - Diluted	$ 0.18		$ 0.33		$ 0.72		$ 0.88
Distributed earnings	10,093,000		8,940,000		19,076,000		17,870,000
Distributed earnings, per weighted average share	$ 0.37		$ 0.34		$ 0.71		$ 0.74
Undistributed earnings	4,998,000		288,000		378,000		3,541,000
Undistributed earnings, per weighted average share	$ 0.18		$ 0.01		$ 0.01		$ 0.15
Weighted average basic shares outstanding, unvested restricted stock	517,596		535,801		476,896		498,286
Unvested Restricted Stock [Member]
Earnings per common share - Basic	$ 0.18	[3]	$ 0.35	[3]	$ 0.80	[3]	$ 0.87	[3]
Earnings per common share - Diluted	$ 0.17		$ 0.35		$ 0.79		$ 0.87
Distributed earnings	180,000		194,000		372,000		361,000
Distributed earnings, per weighted average share	$ 0.35		$ 0.36		$ 0.78		$ 0.72
Undistributed earnings	89,000				7,000		72,000
Undistributed earnings, per weighted average share	$ 0.17				$ 0.02		$ 0.14
Undistributed loss			$ 6,000
Undistributed loss, per share			$ 0.01

[1] Total earnings available to common shareholders include distributed earnings of $10,093,000, or $0.37 per weighted average share, and an undistributed loss of $4,998,000, or $0.18 per weighted average share for the three months ended June 30, 2011. Total earnings available to common shareholders include distributed earnings of $8,940,000, or $0.34 per weighted average share, and an undistributed loss of $288,000, or $0.01 per weighted average share for the three months ended June 30, 2010. Total earnings available to common shareholders include distributed earnings of $19,076,000, or $0.71 per weighted average share, and undistributed earnings of $378,000, or $0.01 per weighted average share for the six months ended June 30, 2011. Total earnings available to common shareholders include distributed earnings of $17,870,000 or $0.74 per weighted average share, and undistributed earnings of $3,541,000, or $0.15 per weighted average share for the six months ended June 30, 2010.

[2] Weighted average basic shares outstanding include 517,596 and 535,801 shares of unvested restricted stock for the three months ended June 30, 2011 and 2010, respectively, and 476,896 and 498,286 shares of unvested restricted stock for the six months ended June 30, 2011 and 2010, respectively.

[3] Total earnings available to unvested restricted stock include distributed earnings of $180,000, or $0.35 per weighted average share, and an undistributed loss of $89,000, or $0.17 per weighted average share, under the two-class method for the three months ended June 30, 2011. Total earnings available to unvested restricted stock include distributed earnings of $194,000, or $0.36 per weighted average share, and an undistributed loss of $6,000, or $0.01 per weighted average share, under the two-class method for the three months ended June 30, 2010. Total earnings available to unvested restricted stock include distributed earnings of $372,000, or $0.78 per weighted average share, and undistributed earnings of $7,000, or $0.02 per weighted average share, under the two-class method for the six months ended June 30, 2011. Total earnings available to unvested restricted stock include distributed earnings of $361,000, or $0.72 per weighted average share, and undistributed earnings of $72,000 or $0.14 per weighted average share, under the two-class method for the six months ended June 30, 2010.