Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 4,850	$ 3,417	$ 14,373	$ 9,275
Other Comprehensive Income
Change in fair value of derivative instruments, net of taxes of $(92) and $(317) for three and nine months ended 2012 and $(1,051) and $(1,221), for three and nine months ended 2011, respectively	(170)	(1,951)	(589)	(2,268)
Unrealized appreciation on available-for-sale securities, net of taxes of $860 and $1,588, for three and nine months ended 2012 and $1,856 and $4,852 for the three and nine months ended 2011, respectively	1,597	3,447	2,949	9,011
Less: reclassification adjustment for realized gains included in net income, net of taxes of $1 for three and nine months ended 2012, and $390 and $614, for three and nine months ended 2011, respectively	1	725	1	1,140
Other Comprehensive Income	1,426	771	2,359	5,603
Comprehensive Income	$ 6,276	$ 4,188	$ 16,732	$ 14,878