Allowance for credit losses - Allowance for loan losses - Additional Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) loans	Dec. 31, 2020 USD ($) loans
Financing Receivable
Troubled debt restructurings	$ 1,656,822	$ 1,668,368
Accruing
Financing Receivable
Troubled debt restructurings	1,468,966	1,394,538
Commercial Loans
Financing Receivable
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings	9,000	14,000
Note A / B Split
Financing Receivable
Troubled debt restructurings	10,200	32,900
Aggregated unpaid principal balance	$ 10,200	35,100
Loans restructuring charge offs		$ 300
Number of loans \| loans	5	10
Note A / B Split \| Discounted payoff
Financing Receivable
Aggregated unpaid principal balance		$ 1,700
Number of loans \| loans		1
Commercial
Financing Receivable
Troubled debt restructurings	$ 326,088	$ 362,797
Commercial \| Accruing
Financing Receivable
Troubled debt restructurings	$ 261,344	$ 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
-Paragraph 11B
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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=123577603&loc=SL6953676-111524

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-Topic 310
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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
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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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
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

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