Certificates and Other Time Deposits (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Time Deposits [Abstract]
Time Deposits, $100,000 or More	$ 577,300,000	$ 936,900,000
Interest Expense, Time Deposits, $100,000 or More	6,300,000	14,100,000	13,300,000
2012	1,217,272,000
2013	357,472,000
2014	85,755,000
2015	57,362,000
2016	24,150,000
2017 and thereafter	1,068,000
Certificates of Deposit, at Carrying Value	$ 1,743,079,000