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Servicing Asset - Unpaid principal balance (Details) - Loan servicing - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Servicing Assets at Fair Value [Line Items] |  |
Loans serviced for others | $ 213,378 | $ 165,961
SBA guaranteed loans |  |
Servicing Assets at Fair Value [Line Items] |  |
Loans serviced for others | $ 213,378 | $ 165,961

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