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Allowance for Credit Losses - Loans - Allowance for credit losses by loan portfolio segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	$ 12,221,000	$ 11,568,000	$ 12,221,000	$ 11,568,000	$ 12,132,000	$ 11,947,000	$ 10,743,000	$ 11,922,000	$ 12,398,000
Charge-Offs	(30,000)	(64,000)	(169,000)	(181,000)
Recoveries	85,000	35,000	108,000	76,000
Provision (Credit)	34,000	(325,000)	335,000	(725,000)
ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,200,000		1,200,000			1,200,000
Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							1,204,000
Other commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	2,849,000		2,849,000		2,873,000	2,908,000
Recoveries	1,000		2,000
Provision (Credit)	(25,000)		(61,000)
Other commercial and industrial | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							2,908,000
Other commercial real estate (non-owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,087,000		3,087,000		3,197,000	3,196,000	5,972,000
Recoveries	3,000		7,000
Provision (Credit)	(113,000)		(116,000)
Other commercial real estate (non-owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							(2,776,000)
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,037,000	1,473,000	1,037,000	1,473,000	1,032,000	1,025,000	1,380,000	1,465,000	1,590,000
Charge-Offs		(23,000)		(23,000)
Recoveries	1,000	4,000	3,000	12,000
Provision (Credit)	4,000	27,000	9,000	(106,000)
Residential mortgage | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							(355,000)
Allocation for general risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans		1,119,000		1,119,000			653,000	1,177,000	1,232,000
Provision (Credit)		(58,000)		(113,000)
Allocation for general risk | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							(653,000)
Commercial | Commercial.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans		3,158,000		3,158,000			2,653,000	3,251,000	3,071,000
Charge-Offs				(72,000)
Provision (Credit)		(93,000)		159,000
Commercial | Commercial real estate (owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,517,000		1,517,000		1,320,000	1,380,000
Recoveries	6,000		12,000
Provision (Credit)	191,000		125,000
Commercial | Commercial real estate (owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							1,380,000
Commercial | Commercial real estate (non-owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans		5,716,000		5,716,000			5,972,000	5,930,000	6,392,000
Recoveries		13,000		26,000
Provision (Credit)		(227,000)		(702,000)
Commercial | Commercial real estate (non-owner occupied) - retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,477,000		1,477,000		1,486,000	1,432,000
Provision (Credit)	(9,000)		45,000
Commercial | Commercial real estate (non-owner occupied) - retail | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							1,432,000
Commercial | Commercial real estate (non-owner occupied) - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,145,000		1,145,000		1,146,000	1,226,000
Recoveries	2,000		3,000
Provision (Credit)	(3,000)		(84,000)
Commercial | Commercial real estate (non-owner occupied) - multi-family | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							1,226,000
Commercial | Commercial (owner occupied real estate and other)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							2,653,000
Commercial | Commercial (owner occupied real estate and other) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							(2,653,000)
Consumer.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-Offs			(169,000)
Consumer. | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,109,000	102,000	1,109,000	102,000	$ 1,078,000	$ 780,000	85,000	$ 99,000	$ 113,000
Charge-Offs	(30,000)	(41,000)	(169,000)	(86,000)
Recoveries	72,000	18,000	81,000	38,000
Provision (Credit)	$ (11,000)	$ 26,000	$ 417,000	$ 37,000
Consumer. | Consumer | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans							$ 695,000

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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