Corporate Structure (Details)	1 Months Ended	3 Months Ended	1 Months Ended
Jun. 30, 2012 Georgetown Bancorp, MHC	Mar. 31, 2013 Georgetown Bancorp, MHC	Jan. 31, 2005 The bank
Conversion and reorganization to stock holding company
Percentage of common stock owned	56.70%		100.00%
Second-step exchange ratio		0.72014

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration