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Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2012
Other Comprehensive Income [Abstract] |
Change in unrealized gains and losses on available-for-sale securities |
|  | Three Months Ended June 30, 2012 |  |  | Six Months Ended June 30, 2012 |
|  | Before Tax Amount |  |  | Tax Effect |  |  | Net of Tax Amount |  |  | Before Tax Amount |  |  | Tax Effect |  |  | Net of Tax Amount |
Unrealized holding gains arising during the period |  | $ | 198,155 |  |  | $ | (75,299 | ) |  | $ | 122,856 |  |  | $ | 306,842 |  |  | $ | (116,601 | ) |  | $ | 190,241 |
Reclassification adjustment for (losses) recognized in income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8,042 | ) |  |  | 3,056 |  |  |  | (4,986 | )
Unrealized holding gains on available for sale securities, net of taxes |  | $ | 198,155 |  |  | $ | (75,299 | ) |  | $ | 122,856 |  |  | $ | 298,800 |  |  | $ | (113,545 | ) |  | $ | 185,255 |
|  | Three Months Ended June 30, 2011 |  |  | Six Months Ended June 30, 2011 |
|  | Before Tax Amount |  |  | Tax Effect |  |  | Net of Tax Amount |  |  | Before Tax Amount |  |  | Tax Effect |  |  | Net of Tax Amount |
Unrealized holding gains arising during the period |  | $ | 453,931 |  |  | $ | (206,410 | ) |  | $ | 247,521 |  |  | $ | 459,133 |  |  | $ | (208,387 | ) |  | $ | 250,746 |
Reclassification adjustment for gains recognized in income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unrealized holding gains on available for sale securities, net of taxes |  | $ | 453,931 |  |  | $ | (206,410 | ) |  | $ | 247,521 |  |  | $ | 459,133 |  |  | $ | (208,387 | ) |  | $ | 250,746 |

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- Definition Schedule of other comprehensive income change in unrealized gains and losses on available for sale securities. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration