Loans Receivable, Net and Allowance for Loan Losses - Summary of Primary Segments of ALL (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	$ 8,662	$ 7,671	$ 8,064	$ 7,302
Charge-offs	(365)	(599)	(1,449)	(2,129)
Recoveries	39	12	221	61
Provision	500	1,100	2,000	2,950
Balance, End of period	8,836	8,184	8,836	8,184
Individually evaluated for impairment	664		664		819
Collectively evaluated for impairment	8,172		8,172		7,245
Balance, End of period	8,836	8,184	8,836	8,184
Residential Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	5,920	5,791	5,787	5,401
Charge-offs	(332)	(509)	(1,255)	(1,752)
Recoveries	34	9	112	50
Provision	312	676	1,290	2,268
Balance, End of period	5,934	5,967	5,934	5,967
Individually evaluated for impairment	531		531		518
Collectively evaluated for impairment	5,403		5,403		5,269
Balance, End of period	5,934	5,967	5,934	5,967
Construction Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	26	28	20	29
Provision	(2)	16	4	15
Balance, End of period	24	44	24	44
Collectively evaluated for impairment	24		24		20
Balance, End of period	24	44	24	44
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,003	837	946	699
Charge-offs	(23)	(74)	(73)	(288)
Recoveries			83	2
Provision	(399)	262	(375)	612
Balance, End of period	581	1,025	581	1,025
Individually evaluated for impairment	96		96		301
Collectively evaluated for impairment	485		485		645
Balance, End of period	581	1,025	581	1,025
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	369	350	337	474
Charge-offs		(16)	(48)	(16)
Recoveries	2		14
Provision	222	27	290	(97)
Balance, End of period	593	361	593	361
Collectively evaluated for impairment	593		593		337
Balance, End of period	593	361	593	361
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	106	106	130	127
Provision	10	7	(14)	(14)
Balance, End of period	116	113	116	113
Collectively evaluated for impairment	116		116		130
Balance, End of period	116	113	116	113
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	500	496	430	499
Charge-offs	(10)		(73)	(67)
Recoveries		3		9
Provision	(17)	97	116	155
Balance, End of period	473	596	473	596
Individually evaluated for impairment	37		37
Collectively evaluated for impairment	436		436		430
Balance, End of period	473	596	473	596
Auto Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision	56		56
Balance, End of period	56		56
Collectively evaluated for impairment	56		56
Balance, End of period	56		56
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	26	19	21	22
Charge-offs				(6)
Recoveries	3		12
Provision	(3)	1	(7)	4
Balance, End of period	26	20	26	20
Collectively evaluated for impairment	26		26		21
Balance, End of period	26	20	26	20
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	712	44	393	51
Provision	321	14	640	7
Balance, End of period	1,033	58	1,033	58
Collectively evaluated for impairment	1,033		1,033		393
Balance, End of period	$ 1,033	$ 58	$ 1,033	$ 58