Loans and Allowance for Loan Losses (Recorded Investment In Nonperforming Loans By Class Of Loans) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	$ 3,840	$ 3,875
Loans 90+ Days Past Due Still Accruing	594	22
Total Nonperforming Loans	4,434	3,897
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	1,953	1,752
Loans 90+ Days Past Due Still Accruing	378	22
Total Nonperforming Loans	2,331	1,774
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	1,423	1,606
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	1,423	1,606
Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	216	0
Total Nonperforming Loans	216	0
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	0	0
Land and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	282	241
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	282	241
Commercial business [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	85	136
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	85	136
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	97	140
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	$ 97	$ 140