Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Allowance for Credit Losses	$ 375,000
Other real estate owned	2,296,000		$ 4,261,000
Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finite-lived intangible assets, net	7,224,000	$ 350,000	331,000	$ 420,000
Mortgage servicing rights (MSR) impairment (recovery)	0	$ 108,000	$ 108,000
Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Carrying amount of loans with a specific allowance	2,100,000
Fair value of loans with a specific allowance	1,700,000
Allowance for Credit Losses	400,000
Fair Value, Nonrecurring | Carrying Amount
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned	2,300,000
Fair Value, Nonrecurring | Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned	$ 942,000