Reserves for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for unpaid losses and loss adjustment expenses, beginning of year	$ 881,344	$ 636,013
Reinsurance recoverable on unpaid losses	121,367	94,819	$ 117,561	$ 83,730
Net reserves for unpaid losses and loss adjustment expenses, beginning of year	763,783	552,283
Incurred losses and loss adjustment expenses:
Current year	110,851	77,333
Prior years	(8,346)	(7,073)
Total net losses and loss adjustment expenses incurred	102,505	70,260
Payments:
Current year	1,142	1,018
Prior years	28,938	27,571
Total payments	30,080	28,589
Reinsurance recoverable on unpaid losses	121,367	94,819	$ 117,561	$ 83,730
Net reserves for unpaid losses and loss adjustment expenses, end of period	836,208	593,954
Gross reserves for unpaid losses and loss adjustment expenses, end of period	$ 957,575	$ 688,773