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Summary of significant accounting policies (Tables) | 12 Months Ended
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Mar. 31, 2017
Schedule of Composite depreciation rate | Depreciation is provided over the estimated useful lives of fixed assets on a straight-line basis at the following rates:
Type of Asset |  | Rate of depreciation
Premises |  | 1.63%
Software and systems |  | 20.00%
Equipment and furniture |  | 10.00%-33.33%
Schedule of Intangible Assets and Amortization Methods | Amortization of intangible assets is computed in a manner that best reflects the economic benefits of the intangible assets as follows:
|  | Useful lives (years) |  | Amortization method |
Branch network |  | 6 |  |  | Straight-line |
Customer lists |  | 2 |  |  | Straight-line |
Core deposit |  | 5 |  |  | Straight-line |
Favorable leases |  | 1 to 15 |  |  | Straight-line |

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- Definition Schedule of Intangible Assets Amortization Computation Factors [Table Text Block] + References No definition available. + Details
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