Concentrations of Credit Risk (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Concentrations of Credit Risk [Abstract]
Collateral held that is equal to the ultimate losses that would be paid or due in the event of insured's default	100.00%
First largest estimated amounts due from individual reinsurers	$ 55,097
Second largest estimated amounts due from individual reinsurers	$ 46,488

The estimated amount recoverable as of the balance sheet date due from first individual reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance of second largest estimated amounts due from individual reinsurers.

No definition available.

Name:	ptvc_ReinsuranceRecoverablesDueFromFirstIndividualReinsurerEstimatedTwo
Namespace Prefix:	ptvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant