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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) loans | Sep. 30, 2020 USD ($) loans | Dec. 31, 2020 USD ($)
Financing Receivable |  |  |
Troubled debt restructurings | $ 1,686,372 |  | $ 1,668,368
Accruing |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | 1,448,219 |  | 1,394,538
Note A / B Split |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | 10,200 | $ 32,400 |
Aggregated unpaid principal balance | $ 10,200 | 32,800 |
Loans restructuring charge offs |  | $ 100 |
Number of loans | loans | 5 | 5 |
Commercial |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | $ 339,319 |  | 362,797
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | 12,000 |  | 14,000
Commercial | Accruing |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | $ 245,601 |  | $ 259,246

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