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Note 12 - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2016 | Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Fair Value of Property Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | 9.60% |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | 13.00% |
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Fair Value of Collateral Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] |  | 8.00%
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Fair Value of Property Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | (3.00%) |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | (3.00%) |
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Fair Value of Collateral Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] |  | (3.00%)
Fair Value, Inputs, Level 3 [Member] | Fair Value of Property Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | (9.60%) |
Other real estate owned | [1],[2] | $ 851 |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] | (13.00%) |
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] |  |  |
Quantitative Information about Level 3 Fair Value Measurements Range | [1],[2] |  | (8.00%)
Impaired loans | [1],[2] |  | $ 363
Fair Value, Inputs, Level 3 [Member] |  |  |
Other real estate owned |  | $ 851 |
Impaired loans |  |  | 363
Other real estate owned |  | 851 |
Impaired loans |  |  | $ 363
[1] | Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
[2] | Fair value is generally determined through independent appraisals of the underlying collateral (in the case of impaired loans) or property (in the case of OREO), which include Level 3 inputs that are not identifiable.

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- Definition Ratio of the appraised fair value of impaired loans produced by qualitative factors such as economic conditions and estimated liquidation expenses. + References No definition available. + Details
Name: | pnbk_FairValueInputsAppraisedValue
Namespace Prefix: | pnbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Ratio of the adjusted appraised fair value of impaired loans produced by qualitative factors such as economic conditions and estimated liquidation expenses. + References No definition available. + Details
Name: | pnbk_FairValueInputsAppraisedValueAdjustment
Namespace Prefix: | pnbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of impaired loans receivable. + References No definition available. + Details
Name: | pnbk_ImpairedLoansFairValue
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the fair value of other real estate owned. + References No definition available. + Details
Name: | pnbk_OtherRealEstateOwnedFairValue
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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