Other Comprehensive Income (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	$ (41,258)	$ 4,101
Other comprehensive income (loss) before reclassifications	11,588	(1,331)
Amounts reclassified from accumulated other comprehensive income (loss)	(793)	17
Net current period other comprehensive income (loss)	10,795	(1,314)
Ending balance	(30,463)	2,787
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(13,099)	(13,373)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	69	69
Net current period other comprehensive income (loss)	69	69
Ending balance	(13,030)	(13,304)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(28,936)	17,111
Other comprehensive income (loss) before reclassifications	11,588	(1,331)
Amounts reclassified from accumulated other comprehensive income (loss)	(818)	(29)
Net current period other comprehensive income (loss)	10,770	(1,360)
Ending balance	(18,166)	15,751
Post-Retirement Unfunded Health Benefit [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	777	363
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(44)	(23)
Net current period other comprehensive income (loss)	(44)	(23)
Ending balance	$ 733	$ 340