Accumulated Other Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Expense	$ 10,090	$ 10,559	$ 16,708
Income tax expense/(benefit)	(142,492)	1,326	(1,039)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net (gain) loss to common shareholders	(358)	(1,866)
Unrealized gains (losses) on available for sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net realized gains on sale of securities	(974)	(2,772)
Income tax expense/(benefit)	373	1,093
Net (gain) loss to common shareholders	(601)	(1,679)
Interest rate swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Expense	12	0
Income tax expense/(benefit)	(5)	0
Net (gain) loss to common shareholders	7	0
Defined benefit plan items [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Personnel expense	382	(302)
Income tax expense/(benefit)	(146)	115
Net (gain) loss to common shareholders	$ 236	$ (187)