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Note 18 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Other real estate owned, fair value |  | $ 851 |
Impaired loans, fair value |  |  | $ 363
Fair Value, Inputs, Level 3 [Member] |  |  |
Other real estate owned, fair value |  | 851 |
Impaired loans, fair value |  |  | 363
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] |  |  |
Other real estate owned, fair value | [1],[2] | $ 851 |
Impaired loans, fair value | [1],[2] |  | $ 363
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Weighted Average [Member] |  |  |
Weighting of qualitative factors(3) | [3] | 22.60% | 8.00%
[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 property (in the case of OREO) or collateral (in the case of impaired loans).
[3] | The weighting of qualitative factors includes items such as economic conditions (positive weight) and estimated liquidation expenses. Regarding OREO, the weighting of qualitative factors is further adjusted by a factor based on historical experience of appraised value to realized sales value, which at December 31, 2016 is a "haircut" to the weighting of 13%.

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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

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- Definition Represents the fair value of other real estate owned. + References No definition available. + Details
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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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- Details
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Namespace Prefix: |
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: |