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EMPLOYEE BENEFIT PLANS - Pension Plan - other (Details) |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2010 | Dec. 31, 2009 | Dec. 31, 2020
Employee Benefit Plans |  |  |
Threshold age of employee who are eligible for pension plan |  |  | 21 years
Threshold period of service of employee to be eligible for pension plan |  |  | 1 year
Pension plan |  |  |
Employee Benefit Plans |  |  |
Pensions paid as annuity using pension formula | 1.50% | 2.00% |
Average of highest consecutive years of total compensation over the last ten years multiplied by credited service up to thirty years to calculate pension formula |  | 5 years |
Total compensation year used for average of the five highest consecutive years multiplied by credited service up to thirty years to calculate pension formula |  | 10 years |
Maximum credited service (in years) |  | 30 years |

X
- Definition Represents the average of highest consecutive years of total compensation over the last ten years multiplied by credited service up to thirty years to calculate pension formula. + References No definition available. + Details
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X
- Definition Represents the maximum credited service. + References No definition available. + Details
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Balance Type: | na
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X
- Definition Represents the pension amount paid as annuity using pension formula. + References No definition available. + Details
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Namespace Prefix: | pbfs_
Data Type: | num:percentItemType
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X
- Definition Represents the threshold age of employee who are eligible for pension plan. + References No definition available. + Details
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X
- Definition Represents the threshold period of service of employee to be eligible for pension plan. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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X
- Definition Represents the total compensation year used for average of the five highest consecutive years multiplied by credited service up to thirty years to calculate pension formula. + References No definition available. + Details
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |