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Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 FinancialCenters
Operating Statistics [Line Items]
Number of principal reporting segment	2
Bank operated Business Financial Centers, number	41
Bank operated Commercial Banking Centers, number	5
Consideration of Business Financial and Commercial Banking Center	1

X

- Definition

Bank operated business financial centers, number.

+ References

No definition available.

+ Details

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X

- Definition

Bank operated commercial banking centers, number.

+ References

No definition available.

+ Details

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- Definition

Consideration of business financial and commercial banking center.

+ References

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X

- Definition

Number of principal reporting segment.

+ References

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+ Details

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- Details

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