Allowance for credit losses - Allowance for loan losses - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) loans	Dec. 31, 2020 USD ($)
Financing Receivable
Troubled debt restructurings	$ 1,707,528	$ 1,668,368
Provision for loan portfolio and unfunded commitments	82,100
Accruing
Financing Receivable
Troubled debt restructurings	1,454,251	1,394,538
COVID-19 \| Payment Deferral
Financing Receivable
Troubled debt restructurings	$ 34,000
COVID-19 \| Curent on payment
Financing Receivable
Percent of loans on payment	94.00%
COVID-19 \| Loan payment moratorium Completed
Financing Receivable
Loan payment moratorium - aggregate book value	$ 6,800,000
number of loans \| loans	122,216
COVID-19 \| Loan Payment Moratorium Remaining
Financing Receivable
Loan payment moratorium - aggregate book value	$ 6,500,000
number of loans \| loans	114,900
Commercial
Financing Receivable
Troubled debt restructurings	$ 389,167	362,797
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings	14,000	14,000
Commercial \| Accruing
Financing Receivable
Troubled debt restructurings	$ 281,234	$ 259,246

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Percent of loans current on payments.

+ References

No definition available.

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Amount of expense (reversal of expense) for expected credit losses of loans and unfunded commitments, from change in macroeconomic factors.

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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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

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-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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- Definition

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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