Fair Value Measurements - Foreclosed Assets Remeasured and Reported at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Foreclosed Assets Remeasured at Initial Recognition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	$ 3,839	$ 6,627
Charge-offs recognized in the allowance for loan losses	(588)	(1,291)
Fair value	3,251	5,336
Foreclosed Assets Remeasured Subsequent to Initial Recognition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	4,778	10,183
Write-downs included in other non-interest expense	(829)	(1,528)
Fair value	$ 3,949	$ 8,655

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

Name:	us-gaap_ForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant