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Summary of Significant Accounting Policies - Summary of Useful Lives of Principal Classes of Assets (Detail)	12 Months Ended
	Dec. 31, 2012
Properties under capital lease and leasehold improvements amortizable description	Shorter of estimated economic lives of 15 years or term of the lease.
Properties under capital lease and leasehold estimated economic lives under option one	15 years
Minimum [Member] | Bank premises [Member]
Estimated lives	15 years
Minimum [Member] | Computer equipment [Member]
Estimated lives	3 years
Minimum [Member] | Furniture, fixtures and equipment [Member]
Estimated lives	5 years
Maximum [Member] | Bank premises [Member]
Estimated lives	40 years
Maximum [Member] | Computer equipment [Member]
Estimated lives	5 years
Maximum [Member] | Furniture, fixtures and equipment [Member]
Estimated lives	7 years

X

- Definition

Properties under capital lease and leasehold estimated economic lives under option one.

+ References

No definition available.

+ Details

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X

- Definition

Properties under capital lease and leasehold improvements amortizable description.

+ References

No definition available.

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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