Loans Receivable (Summary Of Changes In Accretable Yields Of Acquired Loans) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Loans Receivable [Line Items]
Balance	$ 470,811	$ 708,571
Acquisition		146,509
Net transfers from (to) nonaccretable difference to (from) accretable yield	1,119	(236,035)
Accretion	(122,728)	(94,341)
Balance	349,202	524,704
Acquired Impaired Loans [Member]
Loans Receivable [Line Items]
Balance	83,834	82,381
Acquisition		7,346
Net transfers from (to) nonaccretable difference to (from) accretable yield	5,277	23,271
Accretion	(12,878)	(20,232)
Balance	76,233	92,766
Acquired Performing Loans [Member]
Loans Receivable [Line Items]
Balance	386,977	626,190
Acquisition		139,163
Net transfers from (to) nonaccretable difference to (from) accretable yield	(4,158)	(259,306)
Accretion	(109,850)	(74,109)
Balance	$ 272,969	$ 431,938