Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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- Definition

The amount of other than temporary impairment losses on investments in debt securities categorized as Held-to-maturity which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) of investments in debt securities due to credit losses and other than temporary impairments due to other than credit losses when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Investment Securities (Detail) (USD $)	3 Months Ended		12 Months Ended
Investment Securities (Detail) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Sep. 30, 2011	Sep. 30, 2010
Investment Securities Fair Market Value Pledged	$ 237,800,000		$ 123,700,000	$ 217,200,000
Proceeds From Mortgage Backed Securities			203,600,000
Average Yield Rate Of Mortgage Backed Securities			1.79%
Gain On Sale Of Mortgage Backed Securities			3,500,000
Asset-Backed Securities, at Carrying Value				0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	180,000	534,000	503,000	879,000	2,853,000
Impact Percentage Of Other Than Temporary Impairment Losses Investments Available For Sale Securities			8.80%
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Held-to-maturity Securities				1,100,000
Collateralized Debt Obligations [Member]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			41,000
Collateralized Mortgage Obligations [Member]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			$ 462,000