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Fair Value Measurement - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2015 SecurityLoan	Sep. 30, 2014 SecurityLoan
Fair Value Disclosures [Abstract]
Number of impaired loans	257essa_NumberOfImpairedLoans	264essa_NumberOfImpairedLoans
Impaired loans, carrying value	$ 33,900,000essa_ImpairedLoansCarryingValue	$ 37,000,000essa_ImpairedLoansCarryingValue
Impaired loans, valuation allowance	336,000essa_ImpairedLoansValuationAllowance	468,000essa_ImpairedLoansValuationAllowance
Impaired loans, net fair value	$ 33,600,000essa_ImpairedLoansNetFairValue	$ 36,500,000essa_ImpairedLoansNetFairValue