Loans and Allowance for Loan Losses (Allowance For Loan Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	$ 19		$ 19		$ 21
Collectively evaluated for impairment	6,501		6,501		6,229
Acquired with deteriorated credit quality	0		0		0
Ending balance	6,520	$ 6,060	6,520	$ 5,992	6,250
Changes in Allowance for Loan Losses:
Beginning balance	6,514	6,060	6,250	5,538
Provisions	208	300	627	904
Charge-offs	(234)	(395)	(450)	(735)
Recoveries	32	27	93	285
Ending balance	6,520	5,992	6,520	5,992
Residential real estate
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	11		11		13
Collectively evaluated for impairment	604		604		564
Acquired with deteriorated credit quality	0		0		0
Ending balance	615	626	615	641	577
Changes in Allowance for Loan Losses:
Beginning balance	457	626	577	780
Provisions	300	291	298	230
Charge-offs	(156)	(291)	(299)	(388)
Recoveries	14	15	39	19
Ending balance	615	641	615	641
Commercial real estate
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	3,855		3,855		3,808
Acquired with deteriorated credit quality	0		0		0
Ending balance	3,855	3,440	3,855	2,997	3,808
Changes in Allowance for Loan Losses:
Beginning balance	4,109	3,440	3,808	2,826
Provisions	(254)	(587)	47	(48)
Charge-offs	0	144	0	0
Recoveries	0	0	0	219
Ending balance	3,855	2,997	3,855	2,997
Multi-family residential
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	170		170		146
Acquired with deteriorated credit quality	0		0		0
Ending balance	170	271	170	165	146
Changes in Allowance for Loan Losses:
Beginning balance	163	271	146	249
Provisions	7	(106)	24	(84)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	170	165	170	165
Construction Loans
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	549		549		443
Acquired with deteriorated credit quality	0		0		0
Ending balance	549	222	549	251	443
Changes in Allowance for Loan Losses:
Beginning balance	455	222	443	229
Provisions	94	29	106	22
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	549	251	549	251
Land and land development
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	375		375		302
Acquired with deteriorated credit quality	0		0		0
Ending balance	375	356	375	391	302
Changes in Allowance for Loan Losses:
Beginning balance	316	356	302	299
Provisions	59	35	73	92
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	375	391	375	391
Commercial business loans
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	841		841		795
Acquired with deteriorated credit quality	0		0		0
Ending balance	841	907	841	1,295	795
Changes in Allowance for Loan Losses:
Beginning balance	886	907	795	907
Provisions	3	622	93	622
Charge-offs	(48)	(234)	(48)	(234)
Recoveries	0	0	1	0
Ending balance	841	1,295	841	1,295
Consumer
Ending Allowance Balance Attributable to Loans:
Individually evaluated for impairment	8		8		8
Collectively evaluated for impairment	107		107		171
Acquired with deteriorated credit quality	0		0		0
Ending balance	115	238	115	252	$ 179
Changes in Allowance for Loan Losses:
Beginning balance	128	238	179	248
Provisions	(1)	16	(14)	70
Charge-offs	(30)	(14)	(103)	(113)
Recoveries	18	12	53	47
Ending balance	$ 115	$ 252	$ 115	$ 252