Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 1,644,647	$ 1,656,822
Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,495,309	1,468,966
Non-Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	149,338	187,856
Mortgages
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,256,766	1,255,713
Mortgages \| Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,169,976	1,143,204
Mortgages \| Non-Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	86,790	112,509
Commercial
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	324,425	326,088
Commercial \| Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	269,784	261,344
Commercial \| Non-Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	54,641	64,744
Leasing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,178	372
Leasing \| Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,154	325
Leasing \| Non-Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	24	47
Consumer
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	62,278	74,649
Consumer \| Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	54,395	64,093
Consumer \| Non-Accruing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	7,883	10,556
TDR
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	90,890	102,790
TDR \| Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	58,819	61,888
TDR \| Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	18,451	24,736
TDR \| Leasing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	43	42
TDR \| Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 13,577	$ 16,124

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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