Unpaid Losses and Loss Adjustment Expenses - Changes in the Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves - beginning of period	$ 118,676	$ 111,270	$ 109,657	$ 111,270	$ 107,246	$ 107,246
Less: reinsurance recoverables on unpaid losses	(26,559)	(24,218)	(22,022)	(24,218)	(22,579)	(22,579)
Net reserves - beginning of period	92,117	87,052	87,635	87,052	84,667	84,667
Add: incurred losses and LAE, net of reinsurance:
Current period	11,716		8,908	25,300	19,428
Prior period	6,210		3,037	11,988	6,786	1,900	$ 1,900	$ 2,400	$ 1,900
Total net incurred losses and LAE	17,926		11,945	37,288	26,214
Deduct: loss and LAE payments, net of reinsurance:
Current period	5,120		3,044	8,300	3,918
Prior period	9,895		10,694	21,012	21,121
Total net loss and LAE payments	15,015		13,738	29,312	25,039
Net reserves - end of period	95,028	92,117	85,842	95,028	85,842	87,052	84,667
Plus: reinsurance recoverables on unpaid losses	22,824	26,559	20,892	22,824	20,892	24,218	22,579
Gross reserves - end of period	$ 117,852	$ 118,676	$ 106,734	$ 117,852	$ 106,734	$ 111,270	$ 107,246