Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 4,667	$ 2,291	$ 8,946	$ 4,016
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Unrealized Holding Gain (Loss) on Securities Available for Sale, Pre-Tax	(8,779)	2,041	(11,883)	2,985
Tax Effect of Unrealized Holding Gain (Loss) on Securities Available for Sale	3,385	(786)	4,581	(1,150)
Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	(176)	0	52	(1,619)
Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	68	0	(20)	624
Amortization of net unrealized loss on securities transferred from available for sale to held to maturity arising during period, Before Tax	(148)	(135)	(291)	(269)
Tax Effect of amortization of unrealized gains on investment securities transferred from available for sale to held to maturity	57	52	112	104
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(5,593)	1,172	(7,449)	675
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized Holding Losses on Derivatives, before Tax	3,709	(218)	2,936	(432)
Unrealized Holding Lossed on Derivatives, Tax	(1,430)	83	(1,132)	166
Reclassification Adjustment of Losses Included in Net Income, Pretax	2,333	1,874	4,538	3,793
Reclassification Adjustment on Losses Included in Net Income, Tax	(899)	(722)	(1,749)	(1,462)
Derivatives Qualifying as Hedges, Net of Tax	3,713	1,017	4,593	2,065
Total Other Comprehensive Income (Loss), Net of Tax	(1,880)	2,189	(2,856)	2,740
Total Comprehensive Income (Loss), Net of Tax	$ 2,787	$ 4,480	$ 6,090	$ 6,756