Foreclosed Real Estate and Repossessed Personal Property - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013 Property Lot
Foreclosed Assets [Line Items]
Number of developed residential lots	77
Amount of developed residential lots	$ 8.2
Number of real estate Developments	2

The number of real estate properties owned as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant