Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Components And Related Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Comprehensive Income (Loss) [Abstract]
Change in pension plan assets and benefit obligations, Before-tax amount	$ 0		$ 634
Change in pension plan assets and benefit obligations, Tax effect	0	0	222
Change in pension plan assets and benefit obligations, net of income taxes	0	0	412
Unrealized gains (losses) on available-for-sale securities, Before-tax amount	4,320	12,085	930	8,919
Unrealized gains (losses) on available-for-sale securities, Tax effect	1,514	4,229	326	3,121
Unrealized gains (losses) on available-for-sale securities, Net-of-tax amount	2,806	7,856	604	5,798
Reclassification adjustment for gains realized in net income, Before-tax amount		(15,362)		(21,997)
Reclassification adjustment for gains realized in net income, Tax effect		(5,377)		(7,699)
Reclassification adjustment for gains realized in net income, Net-of-tax amount		(9,985)		(14,298)
Unrealized net holding gain (loss) on cash flow hedge, Before-tax amount	225	93	398	297
Unrealized net holding gain (loss) on cash flow hedge, Tax effect	79	33	139	104
Unrealized net holding gain (loss) on cash flow hedge, Net-of-tax amount	146	60	259	193
Other comprehensive income (loss), Before-tax amount	4,545	(3,184)	1,962	(12,781)
Other comprehensive income (loss), Tax effect	1,593	(1,115)	687	(4,474)
Other comprehensive income (loss)	$ 2,952	$ (2,069)	$ 1,275	$ (8,307)