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Allowance for credit losses - Troubled debt restructuring according to their accruing status - Subnote (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable |  |
Financing Receivable Modifications Recorded Investment | $ 1,707,528 | $ 1,668,368
Accruing |  |
Financing Receivable |  |
Financing Receivable Modifications Recorded Investment | 1,454,251 | 1,394,538
Mortgages |  |
Financing Receivable |  |
Financing Receivable Modifications Recorded Investment | 1,217,015 | 1,195,965
Mortgages | Accruing |  |
Financing Receivable |  |
Financing Receivable Modifications Recorded Investment | 1,098,479 | 1,060,193
Mortgages | Guaranteed by us sponsored entities | Accruing |  |
Financing Receivable |  |
Financing Receivable Modifications Recorded Investment | $ 675,000 | $ 655,000

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