Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Derivative [Line Items]
Forward sales of mortgage-backed securities	$ 31.0
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative financial instruments	$ 35.8

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date which have been categorized as available-for-sale.

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