Deposits (Scheduled Maturities Of Time Deposits) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deposits [Abstract]
2012	$ 1,489,692,000
2013	250,636,000
2014	258,768,000
2015	150,553,000
2016	165,122,000
Thereafter	186,613,000
Total time deposits	2,501,384,000	2,732,851,000
Certificates of deposit over $100 thousand	1,100,000,000	1,200,000,000
Interest expense on time deposits of $100 thousand or more	8,500,000	8,800,000	15,300,000
Deposits from certain directors, executive officers and their affiliates	$ 54,500,000	$ 54,000,000