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Significant Accounting Policies (Loans Acquired in a Business Combination) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Pools	Dec. 31, 2011	Apr. 30, 2010 OAK [Member]
Business Acquisition [Line Items]
Outstanding contractual principal balance of loans with deteriorated quality of acquired loan portfolio	$ 392,595,000	$ 492,783,000	$ 105,000,000
Outstanding contractual principal balance of loans without deteriorated quality of acquired loan portfolio			578,000,000
Outstanding contractual principal balance of acquired loan portfolio			$ 683,000,000
Number of pools of aggregate acquired loans based upon common risk characteristics	14

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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