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Business - Additional Information (Detail)	Mar. 31, 2013 FinancialCenters Subsidiary
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of inactive subsidiaries	3
Bank operated Business Financial Centers, number	40
Bank operated Commercial Banking Centers, number	5
Bank operated trust office, number	3

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- Definition

Bank operated business financial centers, number.

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Bank operated commercial banking centers, number.

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- Definition

Bank operated wealth management offices, number.

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- Definition

Number of inactive subsidiaries.

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