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Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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. + References No definition available. + Details
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- Definition Trust preferred securities included in tier one capital. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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