Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	$ (13,716)	$ (33,060)	$ (41,258)	$ 4,101
Other comprehensive income (loss) before reclassifications	(11,180)	4,212	17,131	(32,179)
Amounts reclassified from accumulated other comprehensive income (loss)	69	(666)	(700)	(1,436)
Net current period other comprehensive income (loss)	(11,111)	3,546	16,431	(33,615)
Ending balance	(24,827)	(29,514)	(24,827)	(29,514)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(12,962)	(13,237)	(13,099)	(13,373)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	69	69	206	205
Net current period other comprehensive income (loss)	69	69	206	205
Ending balance	(12,893)	(13,168)	(12,893)	(13,168)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(1,686)	(20,689)	(28,936)	17,111
Other comprehensive income (loss) before reclassifications	(11,180)	4,212	16,888	(32,698)
Amounts reclassified from accumulated other comprehensive income (loss)	0	(691)	(818)	(1,581)
Net current period other comprehensive income (loss)	(11,180)	3,521	16,070	(34,279)
Ending balance	(12,866)	(17,168)	(12,866)	(17,168)
Post-Retirement Unfunded Health Benefit [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	932	866	777	363
Other comprehensive income (loss) before reclassifications	0	0	243	519
Amounts reclassified from accumulated other comprehensive income (loss)	0	(44)	(88)	(60)
Net current period other comprehensive income (loss)	0	(44)	155	459
Ending balance	$ 932	$ 822	$ 932	$ 822

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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