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Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust-preferred securities included in Tier 1 Capital	$ 65.0	$ 111.6
Additional dividends without obtaining prior approval from bank regulators declared and paid	$ 45.2

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- Definition

Additional dividends without obtaining prior approval from bank regulators declared and paid.

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- Definition

Trust preferred securities included in tier one capital.

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