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Regulatory Matters - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Regulated Operations [Abstract]
Trust-preferred securities included in Tier 1 capital	$ 25.0	$ 25.0
Additional dividends without obtaining prior approval from bank regulators declared and paid	$ 152.5

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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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