Allowance for Credit Losses on Loans and Off-Balance Sheet Credit Exposures - Narrative (Details)			3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge offs			$ 4,000	$ 1,000	$ 4,000	$ 2,000
Number of residential real estate loans in process of foreclosure | loan	1	1	1		1
Recorded investment in residential real estate loans in process of foreclosure	$ 40,000	$ 28,000	$ 40,000		$ 40,000
Aggregate interest on nonaccrual loans not recognized	95,000	$ 59,000
Individually impaired loans evaluation threshold	500,000		500,000		500,000
Loans modified in prior 12 months that subsequently defaulted			0		0
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge offs			0	$ 1,000	0	$ 1,000
Individually impaired loans evaluation threshold	$ 500,000		$ 500,000		$ 500,000