Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable
Troubled debt restructurings	$ 1,707,528	$ 1,668,368
TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	118,614	113,309
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
Mortgages
Financing Receivable
Troubled debt restructurings	1,217,015	1,195,965
Mortgages \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	71,623	71,018
Commercial
Financing Receivable
Troubled debt restructurings	389,167	362,797
Commercial \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	26,109	15,236
Leasing
Financing Receivable
Troubled debt restructurings	548	610
Leasing \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	97	150
Consumer
Financing Receivable
Troubled debt restructurings	85,921	87,499
Consumer \| TDR
Financing Receivable
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	20,785	22,508
Non-Accruing
Financing Receivable
Troubled debt restructurings	253,277	273,830
Non-Accruing \| Construction
Financing Receivable
Troubled debt restructurings	14,877	21,497
Non-Accruing \| Mortgages
Financing Receivable
Troubled debt restructurings	118,536	135,772
Non-Accruing \| Commercial
Financing Receivable
Troubled debt restructurings	107,933	103,551
Non-Accruing \| Leasing
Financing Receivable
Troubled debt restructurings	160	218
Non-Accruing \| Consumer
Financing Receivable
Troubled debt restructurings	11,771	12,792
Accruing
Financing Receivable
Troubled debt restructurings	1,454,251	1,394,538
Accruing \| Construction
Financing Receivable
Troubled debt restructurings	0	0
Accruing \| Mortgages
Financing Receivable
Troubled debt restructurings	1,098,479	1,060,193
Accruing \| Commercial
Financing Receivable
Troubled debt restructurings	281,234	259,246
Accruing \| Leasing
Financing Receivable
Troubled debt restructurings	388	392
Accruing \| Consumer
Financing Receivable
Troubled debt restructurings	$ 74,150	$ 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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