Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Components And Related Taxes) (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
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	1,328	17,532	2,258	26,451
Unrealized gains (losses) on available-for-sale securities, Tax effect	464	6,136	790	9,257
Unrealized gains (losses) on available-for-sale securities, Net-of-tax amount	864	11,396	1,468	17,194
Reclassification adjustment for gains realized in net income, Before-tax amount		(3,465)		(25,462)
Reclassification adjustment for gains realized in net income, Tax effect		(1,213)		(8,912)
Reclassification adjustment for gains realized in net income, Net-of-tax amount		(2,252)		(16,550)
Unrealized net holding gain (loss) on cash flow hedge, Before-tax amount	219	238	617	535
Unrealized net holding gain (loss) on cash flow hedge, Tax effect	77	83	216	187
Unrealized net holding gain (loss) on cash flow hedge, Net-of-tax amount	142	155	401	348
Other comprehensive income (loss), Before-tax amount	1,547	14,305	3,509	1,524
Other comprehensive income (loss), Tax effect	541	5,006	1,228	532
Other comprehensive income (loss)	$ 1,006	$ 9,299	$ 2,281	$ 992