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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Financing Receivable Credit Quality Indicators (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] $ 834,147    
2020 339,590    
2019 117,596    
2018 17,373    
2017 4,051    
Prior 1,476    
Total Amortized Cost Basis 1,314,233 $ 1,136,259 $ 1,059,554
FICO Band 1 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 94,541    
2020 44,325    
2019 17,202    
2018 3,955    
2017 1,890    
Prior 847    
Total Amortized Cost Basis 162,760    
FICO Band 2 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 72,711    
2020 27,534    
2019 8,129    
2018 1,023    
2017 358    
Prior 233    
Total Amortized Cost Basis 109,988    
FICO Band 3 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 126,610    
2020 46,235    
2019 17,259    
2018 2,301    
2017 580    
Prior 153    
Total Amortized Cost Basis 193,138    
FICO Band 4 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 148,648    
2020 57,766    
2019 21,762    
2018 2,648    
2017 436    
Prior 73    
Total Amortized Cost Basis 231,333    
FICO Band 5 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 143,735    
2020 58,783    
2019 20,456    
2018 2,780    
2017 334    
Prior 87    
Total Amortized Cost Basis 226,175    
FICO Band 6 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 247,902    
2020 104,947    
2019 32,788    
2018 4,666    
2017 453    
Prior 83    
Total Amortized Cost Basis 390,839    
Small Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 311,414    
2020 95,666    
2019 11,777    
2018 630    
2017 92    
Prior 23    
Total Amortized Cost Basis 419,602 403,062 382,785
Small Loans [Member] | FICO Band 1 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 61,379    
2020 19,124    
2019 3,946    
2018 356    
2017 57    
Prior 13    
Total Amortized Cost Basis 84,875    
Small Loans [Member] | FICO Band 2 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 38,862    
2020 10,041    
2019 1,471    
2018 79    
2017 13    
Prior 3    
Total Amortized Cost Basis 50,469    
Small Loans [Member] | FICO Band 3 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 41,821    
2020 10,924    
2019 1,420    
2018 58    
2017 6    
Prior 1    
Total Amortized Cost Basis 54,230    
Small Loans [Member] | FICO Band 4 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 45,943    
2020 11,916    
2019 1,338    
2018 61    
2017 9    
Prior 3    
Total Amortized Cost Basis 59,270    
Small Loans [Member] | FICO Band 5 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 46,176    
2020 14,275    
2019 1,320    
2018 39    
2017 2    
Prior 1    
Total Amortized Cost Basis 61,813    
Small Loans [Member] | FICO Band 6 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 77,233    
2020 29,386    
2019 2,282    
2018 37    
2017 5    
Prior 2    
Total Amortized Cost Basis 108,945    
Large Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 518,570    
2020 240,399    
2019 103,580    
2018 16,350    
2017 2,774    
Prior 841    
Total Amortized Cost Basis 882,514 715,210 655,932
Large Loans [Member] | FICO Band 1 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 33,140    
2020 25,015    
2019 12,933    
2018 3,554    
2017 1,353    
Prior 583    
Total Amortized Cost Basis 76,578    
Large Loans [Member] | FICO Band 2 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 33,815    
2020 17,377    
2019 6,421    
2018 915    
2017 166    
Prior 110    
Total Amortized Cost Basis 58,804    
Large Loans [Member] | FICO Band 3 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 84,068    
2020 34,859    
2019 15,600    
2018 2,208    
2017 276    
Prior 49    
Total Amortized Cost Basis 137,060    
Large Loans [Member] | FICO Band 4 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 101,488    
2020 44,787    
2019 19,907    
2018 2,472    
2017 312    
Prior 29    
Total Amortized Cost Basis 168,995    
Large Loans [Member] | FICO Band 5 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 96,468    
2020 43,664    
2019 18,653    
2018 2,645    
2017 289    
Prior 22    
Total Amortized Cost Basis 161,741    
Large Loans [Member] | FICO Band 6 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 169,591    
2020 74,697    
2019 30,066    
2018 4,556    
2017 378    
Prior 48    
Total Amortized Cost Basis 279,336    
Automobile Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 1,159    
Prior 598    
Total Amortized Cost Basis 1,757 3,889 4,892
Automobile Loans [Member] | FICO Band 1 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 478    
Prior 247    
Total Amortized Cost Basis 725    
Automobile Loans [Member] | FICO Band 2 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 178    
Prior 119    
Total Amortized Cost Basis 297    
Automobile Loans [Member] | FICO Band 3 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 292    
Prior 99    
Total Amortized Cost Basis 391    
Automobile Loans [Member] | FICO Band 4 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 110    
Prior 39    
Total Amortized Cost Basis 149    
Automobile Loans [Member] | FICO Band 5 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 34    
Prior 63    
Total Amortized Cost Basis 97    
Automobile Loans [Member] | FICO Band 6 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2017 67    
Prior 31    
Total Amortized Cost Basis 98    
Retail Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 4,163    
2020 3,525    
2019 2,239    
2018 393    
2017 26    
Prior 14    
Total Amortized Cost Basis 10,360 $ 14,098 $ 15,945
Retail Loans [Member] | FICO Band 1 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 22    
2020 186    
2019 323    
2018 45    
2017 2    
Prior 4    
Total Amortized Cost Basis 582    
Retail Loans [Member] | FICO Band 2 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 34    
2020 116    
2019 237    
2018 29    
2017 1    
Prior 1    
Total Amortized Cost Basis 418    
Retail Loans [Member] | FICO Band 3 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 721    
2020 452    
2019 239    
2018 35    
2017 6    
Prior 4    
Total Amortized Cost Basis 1,457    
Retail Loans [Member] | FICO Band 4 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 1,217    
2020 1,063    
2019 517    
2018 115    
2017 5    
Prior 2    
Total Amortized Cost Basis 2,919    
Retail Loans [Member] | FICO Band 5 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 1,091    
2020 844    
2019 483    
2018 96    
2017 9    
Prior 1    
Total Amortized Cost Basis 2,524    
Retail Loans [Member] | FICO Band 6 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
2021 [1] 1,078    
2020 864    
2019 440    
2018 73    
2017 3    
Prior 2    
Total Amortized Cost Basis $ 2,460    
[1] Includes loans originated during the nine months ended September 30, 2021.