Other Comprehensive Income (Loss) (Classifications out of accumulated other comprehensive income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense	$ 2,937	$ 2,797	$ 6,239	$ 5,529
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)	170	159	471	307
Unrealized Gains and Losses on Available-for-Sale Securities | Amount Reclassified From Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Gain (Loss) on Securities	262	244	725	472
Income Tax Expense	(92)	(85)	(254)	(165)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)	$ 170	$ 159	$ 471	$ 307