Allowance for credit losses - Allowance for loan losses - Additional Information (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($) loans	Sep. 30, 2020 USD ($) loans	Dec. 31, 2020 USD ($)
Financing Receivable
Troubled debt restructurings	$ 1,686,372		$ 1,668,368
Accruing
Financing Receivable
Troubled debt restructurings	1,448,219		1,394,538
Note A / B Split
Financing Receivable
Troubled debt restructurings	10,200	$ 32,400
Aggregated unpaid principal balance	$ 10,200	32,800
Loans restructuring charge offs		$ 100
Number of loans \| loans	5	5
Commercial
Financing Receivable
Troubled debt restructurings	$ 339,319		362,797
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings	12,000		14,000
Commercial \| Accruing
Financing Receivable
Troubled debt restructurings	$ 245,601		$ 259,246

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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+ References

No definition available.

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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
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
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-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

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