Loans and Allowance for Loan Losses (Recorded Investment In Nonperforming Loans By Class Of Loans) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	$ 3,415	$ 3,823
Loans 90+ Days Past Due Still Accruing	124	93
Total Nonperforming Loans	3,539	3,916
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	2,608	2,358
Loans 90+ Days Past Due Still Accruing	0	83
Total Nonperforming Loans	2,608	2,441
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	593	1,253
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	593	1,253
Multifamily [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
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	27	30
Loans 90+ Days Past Due Still Accruing	0	0
Total Nonperforming Loans	27	30
Commercial business [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	0	81
Loans 90+ Days Past Due Still Accruing	124	0
Total Nonperforming Loans	124	81
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Non accrual Loans	187	101
Loans 90+ Days Past Due Still Accruing	0	10
Total Nonperforming Loans	$ 187	$ 111