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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Schedule of Average Recorded Investment in Impaired Finance Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 27,437 $ 18,426
Interest Income Recognized 669 667
Small Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 8,971 5,521
Interest Income Recognized 247 251
Large Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 17,495 11,142
Interest Income Recognized 414 371
Automobile Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 851 1,669
Interest Income Recognized 8 41
Retail Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 120 94
Interest Income Recognized   $ 4