Fair Value Measurement - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2014 Loans	Sep. 30, 2013 Loans
Fair Value Disclosures [Abstract]
Number of impaired loans	249	233
Impaired loans, carrying value	$ 37,300,000	$ 37,200,000
Impaired loans, valuation allowance	664,000	819,000
Impaired loans, net fair value	$ 36,700,000	$ 36,400,000