Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Beginning balance, OTTI Related Net Unrealized Loss			$ (3,500)
Beginning balance, HTM related Net Unrealized Gain			4,622
Beginning balance, All Other Net Unrealized Gain			96,125
Beginning balance, Defined Benefit Pension and Post-retirement Plans			(54,953)
Beginning balance, Total Accumulated OCI			42,294
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income	(1,320)	53	(1,633)	(336)
Changes in HTM Related Net Unrealized Gain			(1,249)
Unrealized holding gains during the period			39,548
Changes in Defined Benefit Pension and Post-retirement Plans	928	702	2,785	2,187
Other comprehensive income			42,717
Ending balance, OTTI Related Net Unrealized Loss	(1,867)		(1,867)
Ending balance, HTM related Net Unrealized Gain	3,373		3,373
Ending balance, All Other Net Unrealized Gain	135,673		135,673
Ending balance, Defined Benefit Pension and Post-retirement Plans	(52,168)		(52,168)
Ending balance, Total Accumulated OCI	$ 85,011		$ 85,011