Loans Receivable and Allowance for Loan and Lease Losses (Allowance for Covered Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Allowance For Loan And Lease Losses [Line Items]
Balance at beginning of the period	$ 56,437	$ 37,256	$ 53,480	$ 37,256	$ 49,286
Provision for covered loan and lease losses, net	1,467		0	8,624	549
FDIC Indemnification Asset Additional Estimated Losses Recoveries	724	12,000	(444)	12,748	3,201
Balance at end of the period	$ 58,628	$ 56,437	$ 53,036	$ 58,628	$ 53,036