Transfers of financial assets and servicing assets - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Servicing rights on whole loan sales, principal balance	$ 114,000,000	$ 144,000,000
Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale	$ 1,800,000	$ 3,200,000
Weighted average mortgage servicing fees	0.31%	0.30%
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Liabilities Incurred	$ 0	$ 0
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer or Servicing Assets Or Liabilities Description Of Objectives Methodology And Limitations	The sensitivity analyses presented in the table above for servicing rights are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10 and 20 percent variation in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in the sensitivity tables included herein, the effect of a variation in a particular assumption on the fair value of the retained interest is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments and increased credit losses), which might magnify or counteract the sensitivities.
Mortgage loans related to buy-back option program	$ 32,372,925,000	29,506,225,000
Buy Back Option Program
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Repurchased loans	58,000,000	94,000,000
Mortgage loans related to buy-back option program	14,000,000	13,000,000
Loans with recourse
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Loans serviced	600,000,000	700,000,000
Principal amount 60 days or more past due	15,000,000	26,000,000
Residential Mortgage
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale	(1,800,000)	18,400,000
Mortgage loans related to buy-back option program	1,600,000,000	1,600,000,000
Serviced mortgage loans
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Loans serviced	11,100,000,000	12,100,000,000
Serviced mortgage loans \| Loans with recourse
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Repurchased loans	$ 7,000,000	$ 19,000,000

Unpaid principal amount of loans repurchased.

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Weighted average of mortgage servicing fees for each period presented.

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- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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- Definition

This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days.

+ References

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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This is the principal amount outstanding for securitized loans only (across all types of loans).

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Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

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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.

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A description of the objectives, methodology, and limitations of the sensitivity analysis or stress test that shows the hypothetical effect on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) of two or more unfavorable variations from the expected levels for each key assumption that is reported, independently from any change in another key assumption.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 860
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Represents the initial fair value recorded for liabilities incurred on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 50
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