Loans and Allowance for Loan Losses (Aging of Recorded Investment in Past Due Loans) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 7,936	$ 9,263
Current	447,512	432,139
Recorded investment in loans	455,448	441,402
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,184	5,209
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,351	1,977
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,401	2,077
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,176	7,955
Current	177,135	175,715
Recorded investment in loans	183,311	183,670
Residential real estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,522	4,493
Residential real estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	877	1,639
Residential real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,777	1,823
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	564	228
Current	160,288	153,800
Recorded investment in loans	160,852	154,028
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	364	115
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	54
Commercial real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	200	59
Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	391	297
Current	22,670	21,014
Recorded investment in loans	23,061	21,311
Multi-family residential | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	297
Multi-family residential | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	391	0
Multi-family residential | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	79	0
Current	16,911	16,601
Recorded investment in loans	16,990	16,601
Construction Loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	79	0
Construction Loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Land and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	211
Current	11,648	11,114
Recorded investment in loans	11,648	11,325
Land and land development | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	6
Land and land development | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	205
Land and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	634	382
Current	32,610	28,168
Recorded investment in loans	33,244	28,550
Commercial business loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	178	259
Commercial business loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	52	0
Commercial business loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	404	123
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	92	190
Current	26,250	25,727
Recorded investment in loans	26,342	25,917
Consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41	39
Consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31	79
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 20	$ 72