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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 225,439	$ 258,177
Loans charged off	(22,106)	(30,259)
Recoveries of loans previously charged off	3,194	2,219
Net loans charged off	(18,912)	(28,040)
Provision for credit losses	15,000	28,000
Balance at end of period	$ 221,527	$ 258,137

Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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