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Finance Receivables, Allowance for Credit losses and Credit Quality Information (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Summary of finance receivables evaluated for impairment      
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy $ 2,276 $ 1,416  
Customers in Chapter 13 bankruptcy 5,493 5,258  
Total impaired accounts specifically evaluated 7,769 6,674  
Finance receivables evaluated collectively 422,662 430,885  
Finance receivables 430,431 437,559 317,500
Accounts in bankruptcy in nonaccrual status 1,431 1,451  
Amount of the specific reserve for impaired accounts 4,260 3,170  
Average impaired accounts 7,352 5,984  
Amount of the general component of the reserve 20,370 20,446  
Small Installment [Member]
      
Summary of finance receivables evaluated for impairment      
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy 1,380 725  
Customers in Chapter 13 bankruptcy 565 420  
Total impaired accounts specifically evaluated 1,945 1,145  
Finance receivables evaluated collectively 180,520 189,194  
Finance receivables 182,465 190,339 109,970
Accounts in bankruptcy in nonaccrual status 116 97  
Amount of the specific reserve for impaired accounts 1,562 854  
Average impaired accounts 1,564 1,191  
Amount of the general component of the reserve 9,404 10,515  
Large Installment [Member]
      
Summary of finance receivables evaluated for impairment      
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy 326 266  
Customers in Chapter 13 bankruptcy 1,645 1,696  
Total impaired accounts specifically evaluated 1,971 1,962  
Finance receivables evaluated collectively 49,924 55,466  
Finance receivables 51,895 57,428 57,594
Accounts in bankruptcy in nonaccrual status 489 463  
Amount of the specific reserve for impaired accounts 932 802  
Average impaired accounts 2,000 1,779  
Amount of the general component of the reserve 2,219 1,951  
Automobile Purchase [Member]
      
Summary of finance receivables evaluated for impairment      
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy 403 349  
Customers in Chapter 13 bankruptcy 3,187 3,044  
Total impaired accounts specifically evaluated 3,590 3,393  
Finance receivables evaluated collectively 162,222 156,444  
Finance receivables 165,812 159,837 135,848
Accounts in bankruptcy in nonaccrual status 788 850  
Amount of the specific reserve for impaired accounts 1,574 1,405  
Average impaired accounts 3,576 2,901  
Amount of the general component of the reserve 7,640 7,019  
Furniture and Appliance Purchase [Member]
      
Summary of finance receivables evaluated for impairment      
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy 167 76  
Customers in Chapter 13 bankruptcy 96 98  
Total impaired accounts specifically evaluated 263 174  
Finance receivables evaluated collectively 29,996 29,781  
Finance receivables 30,259 29,955 14,088
Accounts in bankruptcy in nonaccrual status 38 41  
Amount of the specific reserve for impaired accounts 192 109  
Average impaired accounts 212 113  
Amount of the general component of the reserve $ 1,107 $ 961