Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of loans receivable acquired during the period. Excludes loans and leases covered under loss sharing agreements.

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Amount of undiscounted balance of loans receivable including the principal, interest, fees, penalties. Excludes loans and leases covered under loss sharing agreements.

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Summary of significant accounting policies - Loan receivable from Xiaoying Housing Loans, net (Details)	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary of significant accounting policies
Allowance for loan principal and interest receivables	¥ 106,479,154		¥ 55,335,741	¥ 102,555,784	¥ 24,709,468	$ 15,438,026	$ 8,022,928
Loan receivable from Xiaoying Housing Loans, net	3,810,393,225		2,484,072,931			552,455,087
Allowance for loans receivable at beginning of the year	55,335,741	$ 8,022,928	102,555,784	24,709,468
Provision for Loans Receivable from Xiaoying Housing Loans	164,641,879	23,870,829	76,395,168	227,210,026
Less: Charge-off	(113,498,466)	(16,455,731)	(123,615,211)	(153,568,756)
Allowance for loans receivable at end of the year	106,479,154	15,438,026	55,335,741	102,555,784	24,709,468
Past-due loans receivables	3,916,872,379		2,539,408,672			567,893,113
Xiaoying Housing Loan [Member]
Summary of significant accounting policies
Allowance for loan principal and interest receivables					48,211,512
Loan receivable from Xiaoying Housing Loans, net	10,061,258		12,083,317			1,458,745
Loans receivable acquired during the year \| $						0	$ 0
Amount of outstanding undiscounted loan receivable	154,623,985		121,854,733			22,418,371
Allowance for loans receivable at beginning of the year				¥ 48,211,512
Provision for Loans Receivable from Xiaoying Housing Loans	(6,066,176)	(879,513)	(377,559)		17,993,570
Less: Charge-off	6,066,176	$ 879,513	377,559		(66,205,082)
Allowance for loans receivable at end of the year					¥ 48,211,512
Past-due loans receivables	10,061,258		12,083,317			1,458,745
Xiaoying Housing Loan [Member] \| Over due 2 - 3 years
Summary of significant accounting policies
Past-due loans receivables			1,392,439
Xiaoying Housing Loan [Member] \| Over due over 3 years
Summary of significant accounting policies
Past-due loans receivables	10,061,258		10,690,878			1,458,745
Xiaoying Credit Loans and other loans
Summary of significant accounting policies
Loan receivable from Xiaoying Housing Loans, net	¥ 3,810,393,225		¥ 2,484,072,931			$ 552,455,087