Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable
Troubled debt restructurings	$ 1,686,372	$ 1,668,368
TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	106,231	113,309
Non-Accruing
Financing Receivable
Troubled debt restructurings	238,153	273,830
Accruing
Financing Receivable
Troubled debt restructurings	1,448,219	1,394,538
Construction
Financing Receivable
Troubled debt restructurings	14,877	21,497
Construction \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	4,397
Construction \| Non-Accruing
Financing Receivable
Troubled debt restructurings	14,877	21,497
Construction \| Accruing
Financing Receivable
Troubled debt restructurings	0	0
Mortgages
Financing Receivable
Troubled debt restructurings	1,253,548	1,195,965
Mortgages \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	65,550	71,018
Mortgages \| Non-Accruing
Financing Receivable
Troubled debt restructurings	118,527	135,772
Mortgages \| Accruing
Financing Receivable
Troubled debt restructurings	1,135,021	1,060,193
Commercial
Financing Receivable
Troubled debt restructurings	339,319	362,797
Commercial \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	23,091	15,236
Commercial \| Non-Accruing
Financing Receivable
Troubled debt restructurings	93,718	103,551
Commercial \| Accruing
Financing Receivable
Troubled debt restructurings	245,601	259,246
Leasing
Financing Receivable
Troubled debt restructurings	495	610
Leasing \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	61	150
Leasing \| Non-Accruing
Financing Receivable
Troubled debt restructurings	98	218
Leasing \| Accruing
Financing Receivable
Troubled debt restructurings	397	392
Consumer
Financing Receivable
Troubled debt restructurings	78,133	87,499
Consumer \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	17,529	22,508
Consumer \| Non-Accruing
Financing Receivable
Troubled debt restructurings	10,933	12,792
Consumer \| Accruing
Financing Receivable
Troubled debt restructurings	$ 67,200	$ 74,707

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=121611835&loc=SL6953423-111524

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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=121611835&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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