Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Income	$ 38,132	$ 33,785
Unrealized gain on securities (net of a $2.5 million and $1.9 million tax effect in 2012 and 2011, respectively)	4,584	3,568
Non-credit related unrealized gain on other-than-temporarily impaired debt securities (net of a $73,000 and $134,000 tax effect in 2012 and 2011, respectively)	135	249
Unrealized gain on derivative financial instruments (net of an $18,000 tax effect in 2012 and 2011)	34	34
Amortization (accretion) of net unrecognized pension and postretirement plan items (net of a $115,000 and $6,000 tax effect in 2012 and 2011, respectively)	214	(12)
Reclassification adjustment for securities gains included in net income (net of a $438,000 and $800,000 tax effect in 2012 and 2011, respectively)	(813)	(1,485)
Other comprehensive income	4,154	2,354
Total Comprehensive Income	$ 42,286	$ 36,139