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Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 FinancialCenters Segment
Segment Reporting [Abstract]
Number of principal reporting segments | Segment	2
Bank operated Business Financial Centers, number	40
Bank operated Commercial Banking Centers, number	7
Consideration of Business Financial and Commercial Banking Centers | Segment	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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X

- Definition

Consideration of business financial and commercial banking center.

+ References

No definition available.

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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- References

No definition available.

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