Loans Receivable - Summary of Troubled Debt Restructuring Granted (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract
Real Estate Loans [Member] | Residential [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts	12	20
Pre-Modification Outstanding Recorded Investment	$ 1,578	$ 3,365
Post-Modification Outstanding Recorded Investment	1,578	3,281
Real Estate Loans [Member] | Construction [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Real Estate Loans [Member] | Commercial [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts		10
Pre-Modification Outstanding Recorded Investment		3,165
Post-Modification Outstanding Recorded Investment		3,102
Commercial [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts		3
Pre-Modification Outstanding Recorded Investment		217
Post-Modification Outstanding Recorded Investment		162
Obligations of States and Political Subdivisions [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Home Equity Loans and Lines of Credit [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts	1	2
Pre-Modification Outstanding Recorded Investment	98	5
Post-Modification Outstanding Recorded Investment	98	4
Other [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Troubled Debt Restructurings [Member]
Financing Receivable Modifications Number Of Contracts [Line Items]
Number of Contracts	13	35
Pre-Modification Outstanding Recorded Investment	1,676	6,752
Post-Modification Outstanding Recorded Investment	$ 1,676	$ 6,549