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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable |  |
Troubled debt restructurings | $ 1,681,367 | $ 1,668,368
Accruing |  |
Financing Receivable |  |
Troubled debt restructurings | 1,437,023 | 1,394,538
COVID-19 | Payment Deferral |  |
Financing Receivable |  |
Troubled debt restructurings | 34,000 |
Commercial |  |
Financing Receivable |  |
Troubled debt restructurings | 347,574 | 362,797
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | 7,000 | 14,000
Commercial | Accruing |  |
Financing Receivable |  |
Troubled debt restructurings | $ 247,125 | $ 259,246

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