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Loan Allowance Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of year $ 669 $ 765 $ 943
Provision for credit losses under letters of credit 9,899 11,222 10,418
Amounts paid to Independent Lender under letters of credit, net of recoveries from customers (9,988) (11,318) (10,596)
Balance at end of year $ 580 $ 669 $ 765