Name:	pl_FinancingReceivableMinimumNumberOfDaysPastDueForCeasingAccrualOfInterest
Namespace Prefix:	pl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the minimum number of days past due at which the entity's policy is to initiate foreclosure proceedings.

No definition available.

Name:	pl_FinancingReceivableMinimumNumberOfDaysPastDueToInitiateForeclosureProceedings
Namespace Prefix:	pl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of financing receivables that are less than 60 days past due but more than 29 days past due.

No definition available.

Name:	pl_FinancingReceivableNumberOfLoans30To59DaysPastDue
Namespace Prefix:	pl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of financing receivables that are less than 90 days past due but more than 59 days past due.

No definition available.

Name:	pl_FinancingReceivableNumberOfLoans60To89DaysPastDue
Namespace Prefix:	pl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of financing receivables that are equal to or greater than 90 days past due.

No definition available.

Name:	pl_FinancingReceivableNumberOfLoansEqualToGreaterThan90DaysPastDue
Namespace Prefix:	pl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of financing receivables that are past due at the balance sheet date.

No definition available.

Name:	pl_FinancingReceivableNumberOfLoansPastDue
Namespace Prefix:	pl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Financing receivables that are less than 60 days past due but more than 29 days past due.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

Name:	us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Financing receivables that are less than 90 days past due but more than 59 days past due.

Name:	us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Financing receivables that are equal to or greater than 90 days past due.

Name:	us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Recorded Investment in financing receivables that are past due at the balance sheet date.