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	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	$ (30,463)	$ 2,787	$ (41,258)	$ 4,101
Other comprehensive income (loss) before reclassifications	16,723	(35,059)	28,311	(36,390)
Amounts reclassified from accumulated other comprehensive income (loss)	24	(788)	(769)	(771)
Net current period other comprehensive income (loss)	16,747	(35,847)	27,542	(37,161)
Ending balance	(13,716)	(33,060)	(13,716)	(33,060)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(13,030)	(13,304)	(13,099)	(13,373)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	68	67	137	136
Net current period other comprehensive income (loss)	68	67	137	136
Ending balance	(12,962)	(13,237)	(12,962)	(13,237)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(18,166)	15,751	(28,936)	17,111
Other comprehensive income (loss) before reclassifications	16,480	(35,578)	28,068	(36,909)
Amounts reclassified from accumulated other comprehensive income (loss)	0	(862)	(818)	(891)
Net current period other comprehensive income (loss)	16,480	(36,440)	27,250	(37,800)
Ending balance	(1,686)	(20,689)	(1,686)	(20,689)
Post-Retirement Unfunded Health Benefit [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	733	340	777	363
Other comprehensive income (loss) before reclassifications	243	519	243	519
Amounts reclassified from accumulated other comprehensive income (loss)	(44)	7	(88)	(16)
Net current period other comprehensive income (loss)	199	526	155	503
Ending balance	$ 932	$ 866	$ 932	$ 866

- 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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