Other Comprehensive Income (Loss) (Classifications out of accumulated other comprehensive income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense	$ 3,302	$ 2,732
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)	(301)	(148)
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	(463)	(228)
Income Tax Expense	162	80
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)	$ (301)	$ (148)