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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable |  |
Troubled debt restructurings | $ 1,649,158 | $ 1,656,822
Commercial |  |
Financing Receivable |  |
Troubled debt restructurings | 328,261 | 326,088
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | $ 9,000 | $ 9,000

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