Accumulated Other Compresensive Income (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Expense (Benefit)	$ 1,199	$ 40	$ 1,679	$ (268)
Amounts Reclassified From Accumulated Other Comprehensive Income	1,235	1,069	2,642	1,171
Unrealized Holding Gains - Investment Securities Available for Sale
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	176		(52)
Income Tax Expense (Benefit)	(68)		20
Amounts Reclassified From Accumulated Other Comprehensive Income	108		(32)
Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity [Member]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	148		291
Income Tax Expense (Benefit)	(57)		(112)
Amounts Reclassified From Accumulated Other Comprehensive Income	91		179
Unrealized Holding Losses Cash Flow Hedging Instruments [Member]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	(2,333)		(4,538)
Income Tax Expense (Benefit)	899		1,749
Amounts Reclassified From Accumulated Other Comprehensive Income	$ (1,434)		$ (2,789)