Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
Jun. 30, 2016	Sep. 30, 2015
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Purchase of common stock	$ 130	$ 313

Refers to common stock equity securities bought and held from the secondary market.

No definition available.

Name:	pbhc_PurchaseOfCommonStockOfFinancialServicesIndustry
Namespace Prefix:	pbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration