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Loan Allowance Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of year	$ 831	$ 1,026	$ 890
Provision for credit losses under letters of credit	11,947	11,208	12,192
Amounts paid to Independent Lender under letters of credit, net of recoveries from customers	(12,045)	(11,403)	(12,056)
Balance at end of year	$ 733	$ 831	$ 1,026

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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