Commitments and Contingencies - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) Building	Sep. 30, 2023 USD ($) Apartment Shop Building	Dec. 31, 2022 USD ($)
Commitments, Contingencies and Guarantees [Line Items]
Off-balance-sheet credit exposure	$ 4,500	$ 4,500	$ 85
Off-balance-sheet, liability, credit loss expense (reversal)	661	$ 1,300
Cumulative Effect, Period of Adoption, Adjustment
Commitments, Contingencies and Guarantees [Line Items]
Off-balance-sheet credit exposure			3,100
Cumberland County, Pennsylvania
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		39
Limited partner capital contribution	10,800	$ 10,800
Project investment amortization period		10 years
Total LIHTCs amount awarded for the project		$ 1,200
Total anticipated LIHTCs amount under the housing project	12,000	$ 12,000
Riverview
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		17
Limited partner capital contribution	4,400	$ 4,400
Project investment amortization period		10 years
Total LIHTCs amount awarded for the project		$ 484
Total anticipated LIHTCs amount under the housing project	$ 4,800	$ 4,800
Number of buildings | Building	3	3
Number of shops under the project | Shop		2
Principal amount of construction loan	$ 3,500	$ 3,500
Debt instrument, interest rate, effective percentage	5.50%	5.50%
Term of construction loan		24 months
Financial Standby Letters of Credit
Commitments, Contingencies and Guarantees [Line Items]
Commitments to extend credit		$ 63,800	$ 57,200