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Guarantees, Commitments, and Contingencies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 33 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 30, 2021 USD ($) Apartment Shop Building | Jun. 30, 2020 Apartment | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2022 USD ($)
Reserve for Off-balance Sheet Activities |  |  |  |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |  |  |  |
Valuation allowances and reserves, balance |  |  | $ 85 |  | $ 72 |  | $ 85
PPP Loans | Small Business Administration |  |  |  |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |  |  |  |
Nonrefundable loan processing fees received |  |  | 3,700 |  | 18,000 | $ 20,900 | $ 42,600
Cumberland County, Pennsylvania |  |  |  |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |  |  |  |
Number of apartments under the project | Apartment |  | 39 |  |  |  |  |
Limited partner capital contribution |  |  |  | $ 10,800 |  |  |
Total LIHTCs amount awarded for the project |  |  |  | 1,200 |  |  |
Total anticipated LIHTCs amount under the housing project |  |  |  | $ 12,000 |  |  |
Project investment amortization period |  |  |  | 10 years |  |  |
Riverview |  |  |  |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |  |  |  |
Number of apartments under the project | Apartment | 17 |  |  |  |  |  |
Limited partner capital contribution | $ 4,400 |  |  |  |  |  |
Total LIHTCs amount awarded for the project | 484 |  |  |  |  |  |
Total anticipated LIHTCs amount under the housing project | $ 4,800 |  |  |  |  |  |
Project investment amortization period | 10 years |  |  |  |  |  |
Number of buildings | Building | 3 |  |  |  |  |  |
Number of shops under the project | Shop | 2 |  |  |  |  |  |
Principal amount of construction loan | $ 3,500 |  |  |  |  |  |
Debt instrument, interest rate, effective percentage | 5.50% |  |  |  |  |  |
Term of construction loan | 24 months |  |  |  |  |  |
Financial Standby Letters of Credit |  |  |  |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |  |  |  |
Commitments to extend credit |  |  | $ 51,700 |  | $ 55,600 |  |

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