Fair Value and Interest Rate Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Short-term borrowings	90 days
Transfer of assets between level 1 , 2 or 3	$ 0	$ 0

Maturing period of borrowings under short term repurchase agreements and other short term borrowings.

No definition available.

Name:	pnbk_MaturingPeriodOfBorrowingsUnderShortTermRepurchaseAgreementsAndOtherShortTermBorrowings
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration