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Note 7 - Deposits (Details) - Summary of the Company’s Deposits (USD $)	Dec. 31, 2014	Dec. 31, 2013
Summary of the Company’s Deposits [Abstract]
Non-interest bearing	$ 63,398,000us-gaap_NoninterestBearingDepositLiabilities	$ 55,358,000us-gaap_NoninterestBearingDepositLiabilities
Interest bearing
NOW	26269.00%us-gaap_WeightedAverageRateDomesticDepositNoticeOfWithdrawal	28618.00%us-gaap_WeightedAverageRateDomesticDepositNoticeOfWithdrawal
NOW	0.0001us-gaap_DepositsNegotiableOrderOfWithdrawalNOW	0.0001us-gaap_DepositsNegotiableOrderOfWithdrawalNOW
Savings	93790.00%us-gaap_WeightedAverageRateDomesticDepositSavings	80983.00%us-gaap_WeightedAverageRateDomesticDepositSavings
Savings	0.0048us-gaap_DepositsSavingsDeposits	0.0030us-gaap_DepositsSavingsDeposits
Money market	24650.00%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket	29310.00%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket
Money market	0.0004us-gaap_DepositsMoneyMarketDeposits	0.0004us-gaap_DepositsMoneyMarketDeposits
Time certificates, less than $100,000	106340.00%pnbk_WeightedAverageInterestRateOfTimeDepositsLessThanOneHundredThousand	129548.00%pnbk_WeightedAverageInterestRateOfTimeDepositsLessThanOneHundredThousand
Time certificates, less than $100,000	0.0073us-gaap_TimeDepositsLessThan100000	0.0105us-gaap_TimeDepositsLessThan100000
Time certificates, $100,000 or more	97876.00%us-gaap_WeightedAverageInterestRateOfTimeDeposits100000OrMore	106387.00%us-gaap_WeightedAverageInterestRateOfTimeDeposits100000OrMore
Time certificates, $100,000 or more	0.0087us-gaap_TimeDeposits100000OrMore	0.0109us-gaap_TimeDeposits100000OrMore
Brokered Deposits	30710.00%us-gaap_WeightedAverageRateDomesticDepositBrokered
Brokered Deposits	0.0047us-gaap_InterestBearingDomesticDepositBrokered
Total interest bearing	379635.00%pnbk_WeightedAverageRateDomesticDepositInterestBearing	374846.00%pnbk_WeightedAverageRateDomesticDepositInterestBearing
Total interest bearing	0.0059us-gaap_InterestBearingDepositLiabilities	0.0074us-gaap_InterestBearingDepositLiabilities
Total Deposits	443033.00%us-gaap_WeightedAverageRateDomesticDeposit	430204.00%us-gaap_WeightedAverageRateDomesticDeposit
Total Deposits	$ 0.0050us-gaap_Deposits	$ 0.0065us-gaap_Deposits

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- Definition

The weighted average interest rate of time deposits less than $100,000.

+ References

No definition available.

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- Definition

The weighted average interest rate for all interest bearing domestic deposit liabilities.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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- Definition

Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

+ References

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-Publisher FASB

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-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.12)

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Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.12)

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- Definition

Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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-Section 03

-Paragraph 12

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Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

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- Definition

The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Publisher SEC

-Name Industry Guide

-Number 3

-Section V

-Paragraph A

-Subparagraph 4

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- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000.

+ References

No definition available.

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The weighted average interest rate of all domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more, at the balance sheet date.

+ References

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The weighted average interest rate for all domestic deposit liabilities.

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The weighted average interest rate for domestic brokered deposit liabilities.

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The weighted average interest rate for domestic money market demand account deposit liabilities.

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The weighted average interest rate for domestic notice of withdrawal demand deposit liabilities.

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The weighted average interest rate for domestic savings deposit liabilities.

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