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Commitments and contingencies (Details) ¥ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2018 CNY (¥)	Mar. 31, 2018 USD ($)
Rental expenses		¥ 595,300	¥ 493,248	¥ 248,264
Minimum lease payments under non-cancellable leases
Year ending December 31, 2019					¥ 398,044
Year ending December 31, 2010					172,549
Year ending December 31, 2021					84,475
Year ending December 31, 2022					49,863
Year ending December 31, 2023					38,426
Thereafter					7,937
Total minimum lease payments					751,294
Capital commitment
Commitment capital expenditures			¥ 2,345,658		¥ 2,638,129
Other commitments
Purchase services from related partner	$ 60.0	390,378
Cooperative lending arrangement
Other commitments
Bank's lending portion under the arrangement		117,700
Private equity fund | Equity investments without readily determinable fair value
Other commitments
Investments in equity investments without Readily determinable Fair Value		¥ 126,100
Maximum limit to invest in equity investments without readily determinable fair value | $	$ 250.0					$ 250.0
Minimum
Term of renewal	1 year				1 year
Minimum | Cooperative lending arrangement
Other commitments
Overdue period (days)	80 days	80 days
Maximum
Term of renewal	10 years				10 years

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The portion of bank's capacity to provide loans under an arrangement.

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Represents the amount of capital expenditures for which the entity had made a commitment.

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Amount of investments made in equity investments without readily determinable fair value.

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The amount maximum limit to invest in equity investments without readily determinable fair value.

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The overdue period of a loan.

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The amount of purchase of services from one of its related partner .

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