Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015 USD ($) Number	Jun. 30, 2014 USD ($) Number	Jun. 30, 2015 USD ($) Number	Jun. 30, 2014 USD ($) Number
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Number of Loans | Number	1	2	3	6
Pre- Modification Principal Balance	$ 3	$ 76	$ 168	$ 931
Post- Modification Principal Balance	$ 3	$ 76	$ 175	$ 959
Residential real estate
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Number of Loans | Number		2	2	5
Pre- Modification Principal Balance		$ 76	$ 165	$ 215
Post- Modification Principal Balance		$ 76	$ 172	$ 235
Commercial real estate
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Number of Loans | Number				1
Pre- Modification Principal Balance				$ 716
Post- Modification Principal Balance				$ 724
Consumer
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Number of Loans | Number	1		1
Pre- Modification Principal Balance	$ 3		$ 3
Post- Modification Principal Balance	$ 3		$ 3