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Preferred Trust Securities and Subordinated Debentures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Debt Instrument [Line Items]
Proceeds from issuance of trust preferred securities	$ 100
Preferred trust securities, interest rate	7.70%
Trust common securities	3.1
Principal amount of junior subordinated debentures	103.1
Subordinated debentures interest rate percentage	7.70%
Credit facility maximum borrowing capacity	$ 300

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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