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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets:
Unearned premiums	$ 27,496	$ 23,925
Advanced premiums	2,325	1,493
Unpaid losses and LAE	2,375	1,660
Share-based compensation	4,065	3,837
Accrued wages	180	189
Allowance for uncollectible receivables	203	212
Additional tax basis of securities	0	33
Capital loss carryforwards	0	3,143
Total deferred income tax assets	36,644	34,492
Deferred income tax liabilities:
Deferred policy acquisition costs, net	(26,442)	(22,613)
Fixed assets	(2,313)	(959)
Unrealized gain/loss	(51)	(1,480)
Other comprehensive income	(1,052)	(5,197)
Unpaid loss and LAE transition adjustment	(436)	(563)
Other	(66)	(329)
Total deferred income tax liabilities	(30,360)	(31,141)
Net deferred income tax asset	$ 6,284	$ 3,351

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