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Amortization of Intangible Assets (Detail)	12 Months Ended
	Mar. 31, 2017
Branch network
Acquired Finite-Lived Intangible Assets [Line Items]
Useful lives (years)	6 years
Amortization method	Straight-line
Customer list
Acquired Finite-Lived Intangible Assets [Line Items]
Useful lives (years)	2 years
Amortization method	Straight-line
Core deposit
Acquired Finite-Lived Intangible Assets [Line Items]
Useful lives (years)	5 years
Amortization method	Straight-line
Favorable leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization method	Straight-line
Favorable leases | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful lives (years)	1 year
Favorable leases | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful lives (years)	15 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 35
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=66005732&loc=d3e15372-109273

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