Other Comprehensive Income (Loss) (Classifications out of accumulated other comprehensive income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense	$ (2,429)	$ (3,438)	$ (8,668)	$ (8,967)
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)	0	369	471	675
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	0	567	725	1,039
Income Tax Expense	0	(198)	(254)	(364)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)	$ 0	$ 369	$ 471	$ 675