Short-Term Borrowings (Detail) (USD $)			12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Federal Home Loan Bank of Boston	Jun. 30, 2014 FHLB Ideal Way Line of Credit	Jun. 30, 2013 FHLB Ideal Way Line of Credit	Jun. 30, 2014 Federal Reserve Bank of Boston	Jun. 30, 2014 Bankers Bank Northeast	Jun. 30, 2014 Short-term borrowings Federal Home Loan Bank of Boston	Jun. 30, 2013 Short-term borrowings Federal Home Loan Bank of Boston	Jun. 30, 2014 Hampden Investment Corporation
Short-term Debt [Line Items]
FHLB advances, weighted average rate	0.53%	1.45%						0.33%	0.37%
Percentage of carrying value of first mortgage and first lien fixed rate home equity loans on owner-occupied residential property and investments held at Hampden Investment Corporation securing borrowings under a blanket lien provided to the FHLB			75.00%
Assets	$ 701,497,000	$ 652,962,000								$ 108,700,000
Line of credit, amount available				2,000,000	2,000,000	10,000,000	7,400,000
Line of credit, amount outstanding				0	0	0
Investments pledged for collateral with FHLB, market value			$ 11,300,000