Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable
Troubled debt restructurings	$ 1,640,640	$ 1,656,822
Accruing
Financing Receivable
Troubled debt restructurings	1,488,548	1,468,966
Non-Accruing
Financing Receivable
Troubled debt restructurings	152,092	187,856
Mortgages
Financing Receivable
Troubled debt restructurings	1,253,001	1,255,713
Mortgages \| Accruing
Financing Receivable
Troubled debt restructurings	1,167,237	1,143,204
Mortgages \| Non-Accruing
Financing Receivable
Troubled debt restructurings	85,764	112,509
Commercial
Financing Receivable
Troubled debt restructurings	324,552	326,088
Commercial \| Accruing
Financing Receivable
Troubled debt restructurings	266,036	261,344
Commercial \| Non-Accruing
Financing Receivable
Troubled debt restructurings	58,516	64,744
Leasing
Financing Receivable
Troubled debt restructurings	162	372
Leasing \| Accruing
Financing Receivable
Troubled debt restructurings	126	325
Leasing \| Non-Accruing
Financing Receivable
Troubled debt restructurings	36	47
Consumer
Financing Receivable
Troubled debt restructurings	62,925	74,649
Consumer \| Accruing
Financing Receivable
Troubled debt restructurings	55,149	64,093
Consumer \| Non-Accruing
Financing Receivable
Troubled debt restructurings	7,776	10,556
TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	92,830	102,790
TDR \| Mortgages
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	59,995	61,888
TDR \| Commercial
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	18,932	24,736
TDR \| Leasing
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	26	42
TDR \| Consumer
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 13,877	$ 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 http://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 http://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 http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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