Loan Securitization (Carrying Values and Classification of the Restricted Assets and Liabilities Relating to the Securitization Activities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Assets And Liabilities Relating To The Securitization [Line Items]
Interest-bearing deposits with banks - restricted for securitization investors	$ 0		$ 272,592
Loans, net of unearned income, excluding covered loans	11,828,943		10,521,377
Allowance for loan losses	(107,351)		(110,381)	(113,903)
Net loans - restricted for securitization investors	0		411,532
Total assets	17,519,613		15,893,808	13,980,156
Secured borrowings - owed to securitization investors	0	360,800	600,000
Total liabilities	15,714,908		14,350,275
Restricted Assets and Liabilities [Member]
Restricted Assets And Liabilities Relating To The Securitization [Line Items]
Cash collateral accounts			4,427
Collections and interest funding accounts			268,165
Interest-bearing deposits with banks - restricted for securitization investors			272,592
Loans, net of unearned income, excluding covered loans			412,988
Allowance for loan losses			(1,456)
Net loans - restricted for securitization investors			411,532
Other assets			2,319
Total assets			686,443
Secured borrowings - owed to securitization investors			600,000
Other liabilities			2,821
Total liabilities			602,821
Unrestricted Assets And Liabilities [Member]
Restricted Assets And Liabilities Relating To The Securitization [Line Items]
Cash collateral accounts	36
Collections and interest funding accounts	0
Interest-bearing deposits with banks - restricted for securitization investors	36
Loans, net of unearned income, excluding covered loans	0
Allowance for loan losses	0
Net loans - restricted for securitization investors	0
Other assets	0
Total assets	36
Secured borrowings - owed to securitization investors	0
Other liabilities	0
Total liabilities	$ 0