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Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Banking And Thrift [Abstract]
Trust-preferred securities included in Tier 1 capital	$ 25.0	$ 65.0
Additional dividends without obtaining prior approval from bank regulators declared and paid	$ 52.6

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Additional Dividends Without Obtaining Prior Approval From Bank Regulators Declared And Paid

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Trust preferred securities included in tier one capital.

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