Loans Receivable (Summary Of Changes In Accretable Yields Of Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Loans Receivable [Line Items]
Balance, beginning of period	$ 470,811	$ 708,571
Net transfers from (to) nonaccretable difference to (from) accretable yield	25,135	(138,453)
Accretion	(61,972)	(54,125)
Balance, end of period	433,974	515,993
Acquired Impaired Loans [Member]
Loans Receivable [Line Items]
Balance, beginning of period	83,834	82,381
Net transfers from (to) nonaccretable difference to (from) accretable yield	(2,071)	(19,304)
Accretion	(6,275)	(5,915)
Balance, end of period	75,488	57,162
Acquired Performing Loans [Member]
Loans Receivable [Line Items]
Balance, beginning of period	386,977	626,190
Net transfers from (to) nonaccretable difference to (from) accretable yield	27,206	(119,149)
Accretion	(55,697)	(48,210)
Balance, end of period	$ 358,486	$ 458,831