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Loans - Disaggregated by class of gross loans and type of concession granted (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Payment Delay |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 1,566 | $ 9
Percentage of Loan Class | 0.10% |
Payment Delay | SBA loans | SBA loans held for investment |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 96 | 9
Percentage of Loan Class | 0.30% |
Payment Delay | Commercial real estate | Commercial loans |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 1,470 |
Percentage of Loan Class | 0.10% |
Term Extension |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 4,736 | 952
Percentage of Loan Class | 0.20% |
Term Extension | Commercial & industrial | Commercial loans |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 1,495 | $ 216
Percentage of Loan Class | 1.10% | 0.20%
Term Extension | Commercial real estate | Commercial loans |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis |  | $ 736
Percentage of Loan Class |  | 0.10%
Term Extension | Residential mortgage loans |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 1,036 |
Percentage of Loan Class | 0.20% |
Term Extension | Home equity | Consumer loans |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost Basis | $ 2,205 |
Percentage of Loan Class | 3.20% |

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