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Regulatory Matters (Narrative) (Details) (USD $)	3 Months Ended
Regulatory Matters (Narrative) (Details) (USD $)	Mar. 31, 2012 Y	Dec. 31, 2011	Mar. 31, 2011
Regulatory Assets [Line Items]
Trust preferred securities	$ 120,000,000
Corporation's aggregate subordinated notes	123,712,000	123,712,000	123,712,000
Maximum dividends available without prior regulatory approval	233,800,000
Removal period of trust preferred securities from Tier 1 capital, years	3
Floating Rate Subordinated Notes [Member]
Regulatory Assets [Line Items]
Corporation's aggregate subordinated notes	$ 100,000,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- Definition

The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures.

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