Significant Accounting Policies (Additional Cash Flow Information) (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Significant Accounting Policies [Abstract]
Cash paid for interest	$ 39,809	$ 47,976
Cash paid for income tax	35,612	47,351
Loans foreclosed and transferred to other real estate owned and foreclosed assets	16,803	12,707
Loans to facilitate the sale of other real estate owned	75	869
Common stock/treasury stock issued to the Corporation's 401(k) stock purchase plan	$ 1,360	$ 7,626