Trust preferred securities - Additional Information (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Debt Disclosure [Line Items]
Number Of Business Trusts Owned	5
Maximum Percentage Of Restricted Core Capital To All Core Capital That May Be Included In Tier One Capital	25.00%
Trust Preferred Securities Subject To Phase Out Provision Of Dodd Frank Act	$ 427,000,000
Amount Of Core Capitals That Exceeded The Maximum Percentage Of Restricted Core Capital That May Be Included In Tier One Capital	$ 0	$ 0
Percent Of Non Qualifying Capital Instruments Allowed For Tier I Capital In 2015	25.00%
Percent Of Non Qualifying Capital Instruments Allowed For Tier I Capital In 2016	0.00%

- Definition

The aggregate amount of restricted core capital elements that may be included in the Tier 1 capital of a banking organization that exceed 25% of the sum of all core capital elements.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of restrictive core capital to all core capital that may be included in Tier One capital.

+ References

No definition available.

+ Details

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- Definition

Number of business trusts owned

+ References

No definition available.

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- Definition

Percent of Non Qualifying Capital Instruments Allowed for Tier I Capital as of January 1, 2015

+ References

No definition available.

+ Details

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- Definition

Percent of Non Qualifying Capital Instruments Allowed for Tier I Capital as of January 1, 2016

+ References

No definition available.

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- Definition

Amount of trust preferred securities subject to phase out provision of Dodd Frank Act.

+ References

No definition available.

+ Details

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