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Fair Value of Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair value security, level 1 to level 2 transfers, amount	$ 0	$ 0	$ 0	$ 0
Fair Value security, level 1 to level 3 transfers, amount	$ 0	$ 0	$ 0	$ 0

X

- Definition

Fair value equity level1 to level2 transfer amount.

+ References

No definition available.

+ Details

Name:	pri_FairValueEquityLevel1ToLevel2TransferAmount
Namespace Prefix:	pri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration