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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Financing Receivable |  |
Accumulated loans modified to borrowers under financial difficulties |  | $ 1,644,647
Commercial |  |
Financing Receivable |  |
Accumulated loans modified to borrowers under financial difficulties |  | 324,425
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | $ 7,000 | $ 12,000

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- Definition 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 https://asc.fasb.org/extlink&oid=123577603&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 https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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