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Allowance for credit losses - Allowance for loan losses - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) loans | Dec. 31, 2020 USD ($) loans
Financing Receivable |  |
Troubled debt restructurings | $ 1,656,822 | $ 1,668,368
Accruing |  |
Financing Receivable |  |
Troubled debt restructurings | 1,468,966 | 1,394,538
Commercial Loans |  |
Financing Receivable |  |
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | 9,000 | 14,000
Note A / B Split |  |
Financing Receivable |  |
Troubled debt restructurings | 10,200 | 32,900
Aggregated unpaid principal balance | $ 10,200 | 35,100
Loans restructuring charge offs |  | $ 300
Number of loans | loans | 5 | 10
Note A / B Split | Discounted payoff |  |
Financing Receivable |  |
Aggregated unpaid principal balance |  | $ 1,700
Number of loans | loans |  | 1
Commercial |  |
Financing Receivable |  |
Troubled debt restructurings | $ 326,088 | $ 362,797
Commercial | Accruing |  |
Financing Receivable |  |
Troubled debt restructurings | $ 261,344 | $ 259,246

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