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Income Taxes - Net Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for credit losses $ 6,491 $ 15,823
Unearned insurance premiums 2,971 2,612
Share-based compensation 2,314 2,888
Amortization of intangible assets 424 675
Accrued expenses 391 565
State net operating loss carryforward 300 32
Deferred contract incentive 163 307
Other 206 50
Gross deferred tax assets 13,260 22,952
Deferred tax liabilities:    
Fair market value adjustment of finance receivables 12,410 17,448
Tax over book depreciation 3,463 2,266
Deferred loan costs 1,633 2,283
Prepaid expenses 395 724
Other 320 198
Gross deferred tax liabilities 18,221 22,919
Net deferred tax liability $ 4,961  
Net deferred tax asset   $ 33